i got invited to sing with luciano pavarotti in the late 90s.n to him and thought this is a guy whose been doing the right work on his instrument. from 15 years old i was doing chicago blues. i had a husky big voice but never knew i was a tenor i never studied above high c, so i went to work on my voice and started singing along with pavarotti. with pauvarotti i learned same vehicle with a new engine. i learned those guys are religious about their voices, when they get on stage and don't have a high c, the crowd turns on them, the big pay off notes, these people know the music, so they're under different pressure and scrutiny. so they religiously protect their voice there's a lot of things i do, eight hours sleep is single most important thing for the voice. >> to hear you say that under scor scores how significant that is. whatever else you do can't substitute for sleep. >> no eight hours. most people who are really singing for couple hours on stage know that. your cords are happy. it's just two muscles. your whole career is around them. and th