Describing the Effect of Familiar Song on Arousal and Awareness for Children With Disorders of Consciousness (DoC)

The goal of this clinical trial is to compare the effect of live music therapy and recorded music on recovery of consciousness in children aged 1 to 18 years who have a disorder of consciousness (DoC) after a severe brain injury. Researchers also want to learn how children respond during music and noise, whether early responses to music are linked to recovery at 6 months, and how parents experience music therapy during their child's hospital stay at The Royal Children's Hospital (RCH) in Melbourne. Participants will: * Take part in a 10-day study period while in hospital. On 8 of the 10 days, they will receive either live or recorded familiar music in random order. Their level of consciousness will be measured before and after each session using a simple behavioural checklist. On the other 2 days, they will take part in video-recorded sessions to compare behavioural responses during live music, recorded music, and white noise. Videos will help capture small changes in movement, eye gaze, or facial expression. * Have their level of consciousness checked again at 6 months after injury to see if early responses relate to later recovery. Parents and caregivers will be invited to take part in an interview about their experiences and observations of music therapy with their child. This study will help researchers understand whether live music therapy provides benefits beyond recorded music and will guide how music therapy is best used to support children and families during recovery from severe brain injury.