"The Battle of Evermore" is the only song Zeppelin ever recorded with a guest vocalist. It features Sandy Denny from Fairport Convention duetting with Robert Plant.
"Light My Fire" was the first song Doors guitarist Robby Krieger wrote. Looking for a universal theme, he decided to write about one of the four elements (air, earth, water, fire).
"Teardrop" by Massive Attack has vocals by Elizabeth Fraser of The Cocteau Twins, who wrote the lyric after learning that Jeff Buckley had died.
We were all party rocking in 2011 with the global smash "Party Rock Anthem," but rap fans know the "Everyday I'm shufflin'" line is a take on "Everyday I'm hustlin'" from the 2006 Rick Ross track "Hustlin'."
"Ain't No Sunshine" by Bill Withers was inspired by the Jack Lemmon movie Days of Wine and Roses.
An unexpected guest vocal: Marianne Faithfull on the Metallica song "The Memory Remains." A star in the '60s, this collaboration helped revive her career.
The Cult frontman tells who the "Fire Woman" is, and talks about performing with the new version of The Doors.
Did Al play on a Beach Boys record? Did he have beef with George Lucas and Coolio? See if you can spot weird but true stories.
Chris Stein of Blondie shares photos and stories from his book about the New York City punk scene.
The Reverend rants on psychobilly and the egghead academics he bashes in one of his more popular songs.
When you free your mind, your ass may follow, but you have to make sure someone else doesn't program it while it's wide open.
Julian tells the stories behind his hits "Valotte" and "Too Late for Goodbyes," and fills us in on his many non-musical pursuits. Also: what MTV meant to his career.