I am developing my ear for hearing parts..i'm a tenor please give me some pointers?

Just sit and listen, listen listen...then try to identify. Even sitting at akeyboard and hearing short llicks and trying to play them from what you heard. Start with short phrases and a key you know with a pitch to work from. Then slowly eleminate the refreance points untill you have the pitches in your head. Drop a line and ill give some more details.