Hi Dan,
I personally have not experienced any more changes with my voice or hair (wish I had,lol) and I have been on 'T' for seven yrs now. I do know of some people who have experienced a rapid growth in facial hair after being on 'T' for five/six yrs, so I don't think you need to worry to much. As for the singing I think you will have to train your voice in order to sing again, just keep practicing !!!
Mark
