I'm so glad your son is all right! The driver's job is to make sure the children are safe. She should have made sure he was in your yard (or wherever he gets off) before even attempting to move that bus. Around here that would have made our local news! We've had so many problems with bus drivers leaving children ON the bus after the route is over (child is asleep), children getting run over by the bus because their bookbag got caught in the door and the driver wasn't paying attention -- so many things.

Your son must really love playing his instrument to carry it off and on the bus everyday. A lot of kids wouldn't do that. That really shows devotion!!