Tom Fine

Six weeks after the world's biggest pop group broke up, the "Quiet Beatle" began work on a monumental three-LP album that stands tall a half-century later. George Harrison's first solo album (his third if you count a movie soundtrack and an experimental-music record) is a masterpiece, a musical minestrone of influences and timestamps. For the artist, it was a sprawling release of creative energy too often pent up in the context of the Beatles.

The reviewer venturing to identify the birth bed of heavy metal music risks wrath. So be it.

The heavy metal genre has many roots. The idea of power chords and music centered on ominous, mythological, and vaguely threatening lyrics goes back centuries; consider the use of European church music in various eras to literally scare the hell out of believers. But heavy metal as we know it started 50 years ago with Black Sabbath's Paranoid.