Book excerpt: The Greatest Music Never Sold is a never-before-attempted look at the legendary lost recordings of the pop music world. It reveals the secrets of 20 albums — works by superstars and supergroups such as Mick Jagger, Seal, Chicago, David Bowie, Prince, Cheryl Crow, the Beastie Boys, U2, and 50 Cent — that have never been officially released. New interviews with artists, band members, producers, engineers, and label executives shine a light into the darkened studio vaults, revealing the ego battles, politics, and career confusion that have buried work by these pop music greats. Certain to apeal to record collectors, bootleggers, and ardent music fans everywhere, The Greatest Music Never Sold is a rare look into one of pop music's hidden corners.