Rob Cavallo: The Producers

Rob Cavallo is a principal architect of the modern rock sound. Having translated Green Day's punk snarl into mainstream magic, he's since worked with acts as diverse as Phil Collins and The Goo Goo Dolls; the latter's “Iris” exemplifies Cavallo's grandiose romanticism. Gently plucked strings on Josh Groban's “Brave”, crushing chords on Paramore's “Ignorance”—they're all within this super-producer's range.