Led Zeppelin IV

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

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

Their seminal fourth album was born out of hardscrabble conditions.

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.

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."

Robert Plant longed for the freedoms of the rural Welch countryside – or, maybe, Middle-earth.

Surveying the song's pop culture legacy — from 'Wayne's World' to cover songs to radio station publicity stunts.