nice, but a little back light would have been nice. I do understand that sometimes we have to take what we can get. But would a littel back light bringing the edge of his trumpet been nice. Good job.
Nice composition, good use of BW, I would only add a bit more contrast (the instrument looses itself in the background to the right). But a very nice shot nevertheless.
Did you use flash? If so, you've burnt out the highlights on the shirt with it, try bouncing the flash. It's a classic composition, but wait until he has a really good expression, say at the climax of the piece.