Led Zeppelin IV

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

Pundits had consistently panned their early work.

They came up with a throwback solution to the impersonal character of a Fall 1970 arena tour.

Their seminal fourth album was born out of hardscrabble conditions.

From bluegrass versions of "Going to California" to jazz takes on "Black Dog" — plus a whole lotta Heart.

Four of rock's most recognizable logos revisited.

Breaking down the band's powerhouse masterpiece, track by track.

Tracks eventually would be included on other albums.

Their best studio album is one that was, quite literally, the most lived in.

A country-blues song from 1929 laid the foundation for one of their most epic tracks.

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.