I was really raised on hip-hop, and hip-hop introduced me basically to all the music I listen to now," he tells Fresh Air's Terry Gross, "and what's sad to me is I can't really listen to hip-hop that much anymore. You know, I mean, there's a lot of great hip-hop out there, but I'm not an avid fan of hip-hop. I always say to people that I left hip-hop in '97, meaning that I departed from listening to predominantly hip-hop and just started really getting into records from the late '60s, early '70s. Once I made that change, I realized how much great music was made back in the day, and it started to become apparent how much we'd lost in music. And that's why I don't listen to much modern music anymore, because it just doesn't stimulate me anymore.