My brother Colin's in the percussion ensemble in his highschool (not to mention band, jazz band, chamber choir , and jazz choir). These pictures are of the jazz band/percussion ensemble concert that was given near the end of the school year this year. They did a vocal percussion piece and Colin dressed as a fictional 80's rocker and jammed out on air drums. He had to 'play' everything they sang. Sometimes he got going quite fast. That's why it appears in some pictures that he has no arms.
