You know, that is interesting to me, too. And I found a few glimmers that music therapists are starting to look more closely at music therapy as something besides a tool to foster social interaction in children who are autistic or have sensory issues. They're longer reads, but I'll bet they'll be interesting.

Berger - On Developing Music Therapy Goals & Objectives

Listening to Autism - This one also quoted extensively from Berger, but as a student paper, it was an easy and enjoyable read.

I also noticed that one of the major sites on SPD listed a kazoo as a great tool to help with oral defensiveness.

Add to that the wonderful works of D.S. Berger (from the reviews, she sounds uniquely awesome), and you have a lot of interesting reading material. Her books are Music Therapy, Sensory Integration and the Autistic Child (published in 2002) and The Music Effect (published in 2006). I didn't really have time to look and see if there was something more recent that referenced her works or were as highly recommended, but I thought these might be a good start. Besides, as a person with music degrees and sensory integration issues, I find the little bit I was able to glean of her concepts eye-opening and encouraging (as well as explanatory of a major part of my life! lol).

Was this something your OT recommended? Just curious.