Led Zeppelin IV

Considering how this LP has been dissected, it might seem difficult. So, we brought in an expert.

Four of rock's most recognizable logos revisited.

Tracks eventually would be included on other albums.

Robert Plant said this song "might be a bit embarrassing at times lyrically, but it did sum up a period of my life when I was 22."

John Bonham's drumming took song "into another stratosphere," Jimmy Page marveled.

Spontaneous shift of gears led the band to create this homage to '50s rock.

Cameron Crowe's movie makes even more sense with deleted scene.

Singer describes titling of 1971 LP as a “kind of Spinal Tap thing.”

Gerald Ford's son recalls cranking it up his first night in the White House.