Back in 1969, rock outfit Led Zeppelin released their very first self-titled record. The cover of the album is incredibly recognizable and features the Hindenburg exploding in the sky.

Led Zeppelin’s only double album, Physical Graffiti, featuring hits like “Kashmir” and “Trampled Underfoot,” was released 50 years ago on February 24, 1975.

No one is more entitled to cover Led Zeppelin than its singer, Robert Plant. His close-harmony duo with the singer and fiddler Alison Krauss excels at making songs sound far older than they are ...