Led Zeppelin IV

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

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 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.

Robert Plant duets with Sandy Denny on elegiac folk ballad.

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