Few artists have created a body of work as rich and varied as Prince. During the '80s, he emerged as one of the most singular talents of the rock & roll era, capable of seamlessly tying together pop, funk, folk, and rock. Not only did he release a series of groundbreaking albums; he toured frequently, produced albums, wrote songs for many other artists, and recorded hundreds of songs that still lie unreleased in his vaults. With each album he released, Prince showed remarkable stylistic growth and musical diversity, constantly experimenting with different sounds, textures, and...