During MT sessions Karol displayed the need for closeness, especially with a parent. Each time his parent left the room made him emotionally unstable, which made interactions with him much more difficult. Karol reacted positively to sounds and jingling objects, which prolonged his attention ability. Moreover, he became much livelier when he heard music. He displayed emotional disregulation during numerous activities.

Initially, Karol attended dyadic sessions with a parent, although he was not able to engage in musical activities, since he mostly displayed the need for closeness with the parent and attempted to cuddle. Over the MT process, he started to display interest in instruments which he put into his mouth, bit, looked at closely from all sides, used them to both produce strange sounds and discover new ways of making them – such behaviours occurred several times during a single session (SOC: A3 – showing interest in the activities presented ³ , A4 – displaying a shared area of focus) At times Karol pressed instruments (especially a guitar, a drum or a rattle) against his face and hit them for increased stimulation. He accepted instrument changes (SOC: B5 - accepting changes) and performed new actions associated with them (e.g. hit the drum’s membrane, attempted to shake the rattle; SOC: B3 – finishing tasks within the time frame). The therapist established musical interaction with Karol and attempted to match his musical forms, which were short and chaotic, often impulsive. To draw Karol’s attention to musical connection, the therapist made changes in rhythm, melody, or harmony (e.g. changes in musical idioms), and yet Karol did not seem to react. Karol was neither emotional, nor responsive for a musical relationship with the therapist.

At times during sessions, Karol seemed absent or unengaged. When withdrawn, he listened to the audio material created by the therapist (RC: A1 – shows awareness of sounds, silence) ⁴ (SOC: E3 – accepting musical contact). During the a cappella vocal improvisations (singing without the accompaniment of an instrument), the client sometimes angled his head towards the source of the sound (RC: A3 – glances at/observes the sound source). Karol's musical actions (including playing simple instruments) were mostly based on auto stimulating actions that prevented him from establishing a connection with the therapist. During these musical productions he displayed significant rhythmicality and the ability to repeat fixed rhythmical patterns – he preserved the same intervals between each sound played, which can signify a well-developed sense of hearing (RC: A5 – imitates simple musical motives), (RC: E1 - plays at the same pace as the therapist, matching at least one beat to the 4/4 metre), (SOC: C1 – prediction of one own movement during sessions with the therapist). During initial sessions, Karol created short vocalizations. They took on the form unrelated to the therapist’s musical material, therefore were most probably an unconscious product (EC: E3 – vocalizations are subconscious) ⁵ , non-imitative in nature (EC: D2 – vocalizations are not imitative). When the therapist initiated the vocalizations, Karol reacted with his own vocalizations with a significant delay (EC: E4 – vocalizations appear with delays); at the same time, his vocalizations diverged from typical speech in terms of speed and fluency (EC: E5 – vocalizations stray form the speed and fluency of typical rhythmical speech).

The change occurred in March of 2015, when Karol, in his constant difficulties to concentrate, began to notice the therapist’s musical responses, thus broadening his own awareness regarding another person, the environment, or musical activities (RC: A1 -shows awareness of sounds, silence). Karol's playing on the instruments (initially short) became stable, rhythmical, and conscious (RC: A5 – imitates simple musical motives; E1 - plays at the same pace as the therapist, matching at least one beat to the 4/4 metre; E2 – imitates simple rhythmical schemes). During the sessions there were moments when Karol put his hands against the guitar and listened attentively to its sound, concentrating on it for a longer period of time (SOC: A3 – showing interest in the activities presented). Free creation using instruments (instrumental improvisations) and sharing an instrument with the therapist (especially a drum, a guitar or a piano; SOC: A4 – displaying a shared area of focus) resulted in Karol maintaining contact with the therapist longer (SOC: A2 - showing awareness of the therapist’s presence). During joint musical activities, Karol displayed increasing awareness of changing musical elements such as pace, melody or mood of a given material (RC: C1 - shows awareness of major changes in pace; C2 – shows awareness of major changes on melody; C5 - shows awareness of major changes in mood).

An important social and communicative factor obtained by Karol during these sessions was the ability to exchange musical material with the therapist. He hit the drum and waited for the therapist’s response. Karol initiated a musical contact, which influenced him positively in terms of emotions – the fact confirmed by his smile, increasing motivation, and involvement in musical actions. Sometimes during the sessions, Karol became a musical leader. He also became more and more active in singing and in vocalizations based on vowels a, o, u, i and the phrase dada (EC: C1 – vocalizations show quality in terms of the key; C2 – vocalizations adjusted to the dynamics of musical activities; C3 – vocalizations of a moderate range of melodies). The vocalizations lasted longer. During the last session, the therapist sometimes paused in his playing and waited for Karol's response, which took on a vocal form. Vocalizations were caused by audio stimulation (the therapist singing the boy’s favourite song or an instrumental improvisation; RC: D1 -vocalizes in response to an audio stimulation; D6 – vocalizes in response to specific musical styles/idioms) and were a response to the therapist’s singing (RC: D3 -vocalizes in response to the non-melodious instruments) or took on the form of free vocal improvisations with the therapist (EC: D1 - the participants vocalizes together with the therapist). The free vocal improvisations were not imitative in nature (EC: D2 – vocalizations are not imitative) but rather were mostly schematic (EC: E6 - vocalizations are schematic) and diverged from the pace and fluency of typical rhythmical speech (EC: E5 – vocalizations stray form the speed and fluency of typical rhythmical speech), however they also occurred much more frequently than during the beginnings of therapy.

Yet another factor influencing Karol's awareness of the surroundings was the need to choose the activity for the session (SOC: E11 – playing the role of leader in an activity). This occurred with the help of large images (the Picture Communication System, PCS – a form of alternative communication; Kaczmarek, 2015; EC: A1 -attempts at communicating; A3 – communicating needs and desires) that depicted appropriate activities (e.g. hugging; EC: A5 - communicating emotional states and the development of ideas), items (e.g. a swing) or instruments (a guitar or a drum). Thanks to the music therapist’s cooperation with a specialist in the field of alternative communication, symbols that enabled the boy to consciously establish relations with the environment were introduced to the therapy, thus making it possible for him to decide on his preferences or activities (SOC: B4 – when possible, initiating new activities by the participant). The application of these symbols resulted in the formation of a specific structure of actions, which increased Karol’s awareness of the therapeutic situation and the changes occurring during sessions (SOC: A10 – presenting the understanding of rules and structure of activities; A12 – displaying signs of the knowledge of the therapeutic situation ; B5 – accepting changes; B6 - participation in structured sessions).The increase in musical engagement might indicate better sensory integration and the sense of security in the relation with the therapist (SOC: E6 -maintaining musical interaction). Karol's later activities and his relationship with the therapist – based on trust – gradually lead the child to achieve independence in making choices and decisions, which resulted in the boy’s growing development possibilities (SOC: A5 - establishing proper interactions with the therapist). Karol was also able to perform alternating actions, especially in rhythmical playing on the drum or the guitar’s resonator (SOC: C1 - prediction of one’s own movement during sessions with the therapist; C3 - sustaining the alternation using hints; E5 - imitating the therapist’s play). It is during such improvisational actions that Karol awaited the therapist’s response (SOC: C4 - waiting for the therapist’s response in the correct moment; D2 - maintaining focus in relation to the therapist), which shows a growing ability to maintain reciprocity in his relationship with the music therapist. The ability to exchange rhythmical beats, which much less frequently took on the form of stimulation, also manifested itself in playing simultaneously with the therapist (SOC: E4 - playing in parallel/simultaneously to the therapist; E8 - cooperating with the therapist). Recreating client’s favourite songs (e.g the welcome song enumerating various body parts or the farewell song) and the shared area of focus directed at performing them, (RC: A4 - differentiates between two various sounds; SOC: A6 - participation in structured sessions; A7 - being flexible in the development of musical activities without refusal or discomfort/stress) resulted in Karol's communicating with the therapist, and in consequence, also his kindergarten group, with much more motivation and joy (SOC: A9 - working to identify the therapeutic purposes during the sessions). He also accepted the therapist’s help in leading and aiding him in showing activities associated with a song well-known to him (SOC: E1 - accepting a controlled interaction; E2 - accepting changes in a controlled interaction; E10 - showing flexibility when playing a known musical structure). The relationship between the therapist and Karol was strong enough for the child to express it with a hug or a smile (SOC: E13 - showing the skills to express a social relationship). During the sessions, Karol's activeness increased significantly and improved his well-being.

According to the interview ⁶ with Karol’s mother, she emphasized that during the MT sessions, the changes in the communication, social, motor and emotional skills as well as the change in the communication ability were the most important to both her and her child. She perceived Karol's musical communication, his ability to imitate vocally or instrumentally (Karol repeating the rhythmical beats to the drum – during initial sessions – with his leg, later – with his hand; a major improvement in vocalization, which made the boy enjoy making various sounds; the introduction of PCS to the music therapy sessions) as part of this communication. Joint vocal and instrumental improvisations were described by her as dialogues, wherein she observed the cooperation and alternating nature of the child’s and the therapist’s actions (social aspect). At the same time, she emphasized the crucial role of the therapist’s approach, methods of reaching the child and interactions established as well as the therapist himself (“many things depend on the therapist”). The child’s mother also stressed that music therapy positively influenced her son’s emotions. It helped develop the ability to “vent bad emotions” redirecting the child’s attention to his favourite songs, which make him smile and cause him to relax (“emotional balm”). In the mother's opinion, MT increased his mobility, developed manipulation in small motor skills (using instruments), and in gross motor skills (all movement-related actions, dancing with each other, marching to music). Karol’s mother noticed that due to the deficit of sight, he treats hearing as compensation. Music therapy enabled him to develop it and assimilate new sounds. His mother commented, “Music therapy is beneficial. Very beneficial. There’s no way we’ll resign. This music will help him and will accompany him.”

In Karol’s case, the experiences of improvisational music therapy and singing familiar and popular songs significantly improved his social and communication skills. Continuing them may not only deepen his competence but also may lead to him gaining new abilities – both in terms of communication and social skills.

Piotr began individual music therapy at home in December 2014 and continues to this day. The sessions last approximately 45 minutes, although their length is always adjusted to the child’s current physical and mental state.

MT with Piotr started with an in-depth analysis of his state and his reactions to musical actions. During the initial sessions, he was minimally active. Lack of willingness to establish any contact with the therapist was demonstrated. Despite his sight impairment, Piotr was closing his eyes (SOC: B2 - showing awareness of the therapist’s presence), turning his head away (SOC: E12 - free use of skills related to independence and interdependence of the therapist; EC: A1 - attempts at communicating; EC: B2 - gesticulations), tried to withdraw, remaining inactive, which could suggest he was aware of what was going on around him (RC: A1 - shows awareness of sounds, silence). He showed no reaction to the appearing instruments (guitar, drum) and the therapist’s voice. However, he was not visibly resistant – he "surrendered" to all the therapist’s actions without defiance. He seemed indifferent, but at the same time accepted being steered during all musical actions, e.g. when the therapist directed his hand to the guitar’s strings, the drum’s membrane or pressed his hand against the guitar to make him feel the instrument’s vibrations (SOC: E1 - accepting a controlled interaction; E2 - accepting changes in a controlled interaction). Vocalization was very short (approx. 2 seconds) and resembled a sigh (EC: D2 - vocalizations are not imitative), but the child’s behaviour indicated that, despite its shortness, he was aware of it (EC: E3 - vocalizations are subconscious).

During the first three sessions, Piotr reacted to sounds with a certain degree of oversensitivity, since each unexpected musical stimulus provoked a short epilepsy fit. At that time, during the sessions, Piotr was continuously monitored. This enabled the therapist to observe and recognize the child’s reactions to the instrument being used, its volume, way of making sounds, the musical phrase produced by the therapist and each of the therapist’s movements and actions. For the good of the child, the therapist had to adapt to each, even the smallest, movement of the child, therefore most of his actions were direct results of the observed physiological activities of the child – the regularity of his breathing, turning his head to the sides, or opening his eyelids. The therapist followed such signals, applied appropriate improvisation techniques (imitation and accompanying; Wigram 2004), and could turn Piotr’s musical and non-musical activities into their joint musical material. During the improvisation, the therapist introduced a structure based on a repeating guitar accompaniment. As part of the accompaniment, at certain points the therapist created a pause in the music to increase the client’s attention or observe his reactions to the lack of a musical stimulus. It has already been mentioned that during initial sessions Piotr was neither active and involved nor willing to establish contact. There were only moments when he opened his eyes when he heard a certain guitar phrase or moved his right hand more vigorously (RC: A4 - differentiates between two various sounds). In case of the latter, the therapist attempted to follow the child’s hand by putting a drum under it to make Piotr aware to the purpose of his movements. The therapist did not introduce any diverse forms of musical expressions – such as wide range of the dynamics or idioms (containing differences in harmony and emotional tension) – knowing that each sudden change might cause an epileptic seizure.

As time passed, thanks to regular therapy sessions and cooperation with the parents, Piotr's activeness gradually began to increase. His body movements became freer and his vocal activities, initially involving only grunting or muttering, turned into short vowel-based vocalizations. Piotr began to turn his head towards the source of the sound (RC: A2 - turns head towards the sound source) and became still after hearing new sounds, when receiving a new audio stimulus (RC: A3 - glances at/observes the sound source). The most important change to occur during the MT process was the decreasing frequency of epileptic events (obviously connected to the general improvement of Piotr's state, application of properly-selected medications and Piotr gradually becoming accustomed to the sessions). This made it possible for the forms of musical improvisation to become longer, more intense, and most importantly for Piotr to discover his freedom and desire to sing at his own discretion, by using his possibilities and skills – confirmed by the above-mentioned vocalizations, leg motions, or general body movements (SOC: A2 - showing awareness of the therapist’s presence; B8 - appropriate development of activeness; EC: A1 - attempts at communicating; B2 - gesticulations). Such actions were Piotr's method of communication, perception, and interaction with the therapist.

Music therapy sessions in June and July indicated that Piotr's awareness of the therapeutic situation, the activeness and the structure of the sessions, was rising (SOC: A10 - presenting the understanding of rules and structure of activities; A12 - displaying signs of the knowledge of the therapeutic situation; B6 - participation in structured sessions). The following musical and non-musical behaviours were indicators of this awareness (SOC: A3 - showing interest in the activities presented): changing movements in response to a phrase sang by the therapist (RC: A1 - shows awareness of sounds, silence); all sound-related productions of the child: vocalizations, babbling, other specific creations occurring in response to singing (RC: D1 - vocalizes in response to an audio stimulation; D3 - vocalizes in response to the therapist’s singing) or the therapist’s repeating musical motive; Piotr's movements or vocalization in response to unfamiliar melodies (EC: B4 - combination of gesticulations and vocalizations; C1 - vocalizations show quality in terms of the key); adjusting the key of his own vocal creations to match the creations of the therapist (RC: D5 - vocalizes in response to melodious instruments; D8 - sings in the proper key with the therapist); increased concentration during rests (breaks in music; RC: C2 - shows awareness of major changes in melody). Gradually, Piotr joined the improvisation at his own free will, by filling in the rests, purposefully created by the therapist (RC: D9 - vocalizes during a musical rest initiated by the therapist; SOC: C4 - waiting for the therapist’s response in the correct moment). Moreover, in these moments, Piotr found room for his own expression which resulted in the appearance of musical alternation (dialogue with the therapist) – the therapist presented short musical motives with a guitar accompaniment and paused in certain moments to wait for the child’s response; there always was one, although after various periods of time (SOC: A5 - establishing proper interactions with the therapist; C1 - prediction of one’s own movement during sessions with the therapist; C3 - sustaining the alternation using hints). Piotr’s mother expressed her opinion in an interview, saying that these musical dialogues that she called “musical discussions” positively influenced her child’s communicative competence (SOC: E5 - imitating the therapist’s play; E6 - maintaining musical interaction) as well as his well-being (smiling; SOC: A9 - showing attitude positive to others). Epileptic seizures occurred sometimes during the sessions, but after each such disruption, Piotr returned to the interrupted musical activities (SOC: D3 - returning to the interrupted activities, with hints, after disruptive actions). By analyzing the process of cooperation with the child, the therapist noticed a certain regularity in his behaviour – Piotr was vocally active when the accompaniment assumed the minor key of a given musical material (EC: C5 - vocalizations take on the length of sentences; SOC: E6 - maintaining musical interaction), at that time he also took on the role of a musical leader who, in specific moments, was independent from the therapist’s musical material (RC: D6 - vocalizes in response to specific musical styles/idioms; SOC: E11 - playing the role of a leader in an activity; E12 - free use of skills related to independence and interdependence of the therapist; EC: D1 - the participant vocalizes together with the therapist). As time passed, the number of sounds in his vocalizations visibly increased (Piotr smoothly went from a single vocalization to two or even three sounds, e.g. ahh, ooo, oogahh; EC: E5 - vocalizations stray from the speed and fluency of typical rhythmical speech), and his concentration level was higher than in any other form of musical accompanying (a similar phenomenon of preferring certain musical activities also occurred with Karol; SOC: A4 - displaying a shared area of focus; A9 - showing attitude positive to others; D1 - maintaining the length of focus; D2 - maintaining focus in relation to the therapist; EC: C4 - vocalizations take on the length of word phrases).

The nature of the improvisations (especially during the last sessions) was nostalgic. Phrases were mostly based on several sounds occurring in one-second intervals (EC: C3 - vocalizations of a moderate range of melodies), but sometimes the therapist presented intervals of a wider range, e.g. sixth, seventh, imitated by the boy after a while (RC: A4 - differentiates between two various sounds; D11 - imitates rising musical intervals higher than the major second; D14 - imitates gradually rising musical motives with an interval range greater than a second, immediately after hearing them; SOC: E10 - showing flexibility when playing a known musical structure). Piotr emanated the desire to express himself – when the therapist increased the dynamics of improvisation, the child’s voice became significantly stronger (RC: C3 - shows awareness of major changes in dynamics; SOC: E8 - cooperating with the therapist; EC: C2 - vocalizations adjusted to the dynamics of musical activities). In the child’s vocalization, a fragmentation of rhythmical values, which made the impression of increasing the pace and the dynamics of improvisation, could be heard (SOC: B4 - when possible, initiating new activities by the participant). Clear rhythm-emphasizing accents were also obvious. Piotr's vocalizations were at times imitative (EC: D3 - imitative vocalizations) and at times, depending on his state, delayed (EC: E4 - vocalizations appear with delays). The therapist attempted to encourage his movements, especially small motor skills. She often placed his hands on various instruments to help him sensorily experience them and their sounds (SOC: E1 - accepting a controlled interaction). These forms of musical involvement put the client not only in control over the execution, but also over the decision about the musical nature of all the actions undertaken with the therapist, which is a crucial developmental aspect in both the communicative and social sphere (SOC: C5 - maintaining alternation without hints; E3 - accepting musical contact).

The interview ⁸ with Piotr's mother revealed that she noticed visible changes in her child’s communication brought on by the MT interventions. The areas of change indicated by her included: becoming more sensitive, the joy heard in the sounds created, musical discussions, and the activation of the oral domain. Asked about the change in Piotr's social ability,his mother claimed the question was not so simple, since Piotr’s social skills depend on his physical and mental state as well as the number and intensity of the seizures. The child’s activeness during sessions – not only in the forms of vocalization or dialogues, but also the fact that he used his whole body (hands and legs) to play instruments was to his mother both an enormous positive surprise and, at the same time, a confirmation of the success of the music therapy.

The mother emphasized that the time when her child began music therapy was hard for them, mostly due to the high number of seizures. One of her expectations for the MT was that “music would bring him calmness and pleasure.” As it turned out, it gave him much more – not only calmness and joy but also improved his communication through the “musical discussions” and motor skills by activating his hands, legs, and whole body. Familiar songs, which were heard in his day-to-day life at home, sang or listened to with his parents (Four Elephants or a song about a crocodile in the Nile), and the vocal and instrumental improvisations used during the music therapy sessions were the forms of musical activities that contributed to the development of Piotr’s social and communication domains.

When asked about the benefits of MT, Piotr's mother responded, “Music therapy is definitely a beneficial type of therapy. I absolutely recommend it, since it improves the development in its entirety […]. Healthy children also have music, why should disabled children be deprived of it?” Continuing her response, the mother emphasized, "Music therapy is very important. I wouldn’t say it’s the most important, but it gives my child pleasure. He not only makes an effort during sessions, but also feels joy”.