Rick Rubin, MTV’s “most important white boy in hip-hop,” has produced some of the most influential and creative albums of the past two decades with artists like The Beastie Boys, LL Cool J, Slayer, Tom Petty, Johnny Cash, The Red Hot Chili Peppers, Rage Against the Machine, System of a Down, Nine Inch Nails, Audioslave, Jay-Z, Saul Williams — and the list just keeps on going. Here Rick and Ken discuss why truly great music almost always transcends our concepts of genre, before waxing philosophic about rock, romance, and the potential perils of paternity….