Thanks for the suggestion, Marion. Yes, I do play guitar, and "cooperative guitar" is a regular and favorite part of our music time. Except my charges are so little that they can sit in my lap and use the correct positioning for strumming. Participation for some may mean feeling the vibrations as the guitar is being played, and of course......smiling.......Musicman, thanks for the link. I am another who would like formal training in music therapy, but have been intimidated by the classical training requirement...
Regarding labels....I have a friend who uses the term "differently abled." While it doesn't "define" it certainly honors the individual. I like that.