Just in time for their 50th anniversary, one of the world’s most prolific bands is broken down track-by-track, album-by-album in this expanded edition revised to include rarities, outtakes, and B-sides from their storied catalog​.

Formed by the unlikely alliance of two ace London studio musicians and two bar-band bumpkins from the north, Led Zeppelin went on to create the template for the marauding modern rock ’n’ roll band. Though Zeppelin is often described as “heavy,” any true fan will tell you that the band’s catalog is actually a complex amalgam of blues, psychedelia, rock, folk, and country that reflect the influences on all of Led Zeppelin’s four members.

Veteran music journalist Martin Popoff picks apart each of these 81 studio tracks as well as a slew of non-album tracks in exquisite detail, and for the first time ever, analyzing the circumstances that led to their creation, the recording processes, the historical contexts, and more.