Sounds like it could be a good idea. I've always loved music, it's soothing to the soul. Though I hated music class at school and it was actually the biggest source of me getting into trouble. I found it very hard to stay focused with all of the noise and forced group activities. I have really bad sensory issues, mostly auditory, so people banging xylophones and drums right next to me was never fun. Low volume headphones may be a good idea for kids with similar sensory issues, that way it cuts out some of the background noise from the rest of the class but the headphones aren't too loud as to hurt them either.

I wish you luck.