Autism spectrum disorder (ASD) is a neurodevelopmental condition characterised by profound communication and social interaction deficits. It can lead to social anxiety and depressive thought patterns, leaving the individual unable to be a productive member of society. Music therapy is a method that applies musical experiences and the relationships that develop through the sessions to train communication skills, thus addressing one of the core difficulties of ASD. However, music therapy requires musical instruments that are not always easily accessible and can be an anxiety-inducing experience. This paper presents a multiplayer virtual reality application designed to allow a music therapist to help a child develop social skills in a virtual environment through musical activities. The application is designed in collaboration with two music therapists and two psychologists and includes a qualitative evaluation of the application.