Led Zeppelin's first LP came out in January of 1969, but by November of 1971 they were already on their fourth album. It was a stunning run. Each of the first tour discs are amazing in its own way, but most fans feel that IV stands alone above them, and it's not just for "Stairway to Heaven." There isn't a weak moment on the album, from the opening notes of "Black Dog" through the end of "When the Levee Breaks." "Going to California" is the finest ballad, and "Rock and Roll" is the group at their stadium-shaking best. Like Pink Floyd's The Dark Side of the Moon, this is an album that generation after generation of 15-year-olds discover, even if it's not on Spotify.