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.

Mark celebrates the innovators and outsiders who harnessed the power of synthesizers and shares Kevin Parker's (Tame Impala) love for their sound.