I was around nine when a babysitter snuck 'Who's Next' onto the turntable. The parents were gone. The windows shook. The shelves were rattling. Rock & roll. That began an exploration into music that had soul, rebellion, aggression, affection.

Music rhythms are mathematical patterns. When you hear a song and your body starts moving with it, your body is doing math. The kids in their parents' garage practicing to be a band may not realize it, but they're also practicing math.

Why should the devil have all the best tunes?

I only knew classical music, which to me was the only true music. The only way I could survive at the bar was to mix the classical music with popular songs, and that meant I had to sing. What happened was that I discovered I had a voice plus the talent to mix classical music together with more popular songs, which at the time I detested.

One thing that sticks in my mind is that jazz means freedom and openness. It's a music that, although it developed out of the African American experience, speaks more about the human experience than the experience of a particular people.

Hip-hop kind of absorbed rock in terms of the attitude and the whole point of why rock was important music. Young people felt like rock music was theirs, from Elvis to the Beatles to the Ramones to Nirvana. This was theirs; it wasn't their parents'. I think hip-hop became the musical style that embraces that mentality.