Mark, T-Pain, and Charli XCX break down Auto-Tune—aka "robot sadness"—the musical accident that evolved into an empowering game changer.

The debate rages on—is sampling tribute or theft? One thing's clear: It better be funky. Mark, Paul McCartney, and DJ Premier dig in.

Working with Amy Winehouse kicked off Mark's emotional journey with reverb. Today, he travels around the world to unearth its infinite potential.