When I was in the studio with Madonna, we would work 12-hour days. If you want to work with the best, then that's what you have to do.

APA is another evolution in my career; they have unique vision and share my goals for the future. I look forward to expanding our horizons together.

I had Ice Cube on my first album, "Bunker," and then I did a remix for Snoop Dogg. I've worked with Grandmaster Flash and Pharrell. It's a different work process and there's a different take with how you produce [hip-hop].

When I collaborated with Nelly Furtado, the idea for the song structure came from myself, but the lyrics and the ideas behind the songs came from her.

Madonna has a very unique style and comes up constantly with these great songs.

Why people used to go to clubs was to have a great time and to forget their troubles and worries and stresses of the week and enjoy themselves and I think that the music was a huge, important part of that

Let their music skill speak for [itself]. If they are producing good tracks and are resonating with their fans, or even gaining new fans, then that's great.