I’m nearly eighty. I’ve played the tuba as a jazz improviser for nearly fifty-nine years. The tuba, a brass instrument, is not a trombone or a trumpet. It’s big, cumbersome, heavy. Earlier there was never a question. I always played a gig standing up. It’s different now. I sit down because my legs and lower back begin to hurt after an hour of standing. I’m trying to figure out the best way to support the instrument sitting down, using a stand, like a snare drum stand, with three legs at the bottom.