I have met two trangendered musicians - both M>F. One a folksinger who is still an excellent guitarist and whose voice seems to have made the transition well - Leadfingers knows her. Another sings alto with a well-known London choir. I am quite impressed with the way that the voice re-assignment has worked - I assume that some sort of vocal chord "shaving" was used. Both of them sang as males of course, but definitely in the latter case, the new voice is exceptionally good.