The relationship between popular music and consumer brands has never been so cosy. Product placement abounds in music videos, popular music provides the soundtrack to countless commercials, social media platforms offer musicians tools for perpetual promotion, and corporate-sponsored competitions lure aspiring musicians to vie for exposure. Activities that once attracted charges of 'selling out' are now considered savvy, or even ordinary, strategies for artists to be heard and make a living. What forces have encouraged musicians to become willing partners of consumer brands? At what cost? And how do changes in popular music culture reflect broader trends of commercialization? Selling Out traces the evolution of 'selling out' debates in popular music culture and considers what might be lost when the boundary between culture and commerce is dismissed as a relic. In a moment when branding, advertising, and commercialism dominate popular music, Selling Out makes a powerful claim: that far from being passé, the idea of "selling out" is as important as ever, and protects something fundamental about music and music making.