Lurker, I'm not sure where I came across the story of a group of young American music students (Julliard, maybe) who used to get together on occasional weekends to play from sight. One day, they were tootling away at a clarinet piece when an elderly gent peeped over the fence and said something along the lines of, "I play a little, could I join you?" Reluctantly, they humoured him (although I suppose they think they humored him) and, yes, it turned out to be Benny Goodman. The lovely thing is that they tell the story against themselves. I'll see if I can find it somewhere.