"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.
Janet Jackson wrote the lyric to "Nasty" in response to random guys calling her "baby."
Before she was famous, Lady Gaga was a staff songwriter, and wrote the song "Quicksand," which Britney Spears recorded in 2008.
Rihanna was Pitbull's first choice to sing on "Timber," but she wasn't available at the time so he enlisted his RCA labelmate Kesha instead.
Yoko Ono has always denied requests to cover "Imagine" with the line "no religion, too" omitted or changed.
"Happy Xmas (War Is Over)" is based on billboards John Lennon and Yoko Ono posted two years earlier declaring "War Is Over! If You Want It."
When a song describes a wedding, it's rarely something to celebrate - with one big exception.
The Christian rapper talks about where his trip to Haiti and his history of addiction fit into his songs.
"25 or 6 to 4" to "Semi-Charmed Life" - see if you can spot the songs that are really about drugs.
What happens when Kurt Cobain, Iron Maiden and Johnny Lydon are told to lip-synch? Some hilarious "performances."
Johnny Depp, Angelina Jolie, Mila Kunis and John Malkovich are just a few of the film stars who have moonlighted in music videos.
Yngwie Malmsteen and Steve Vai were two of Graham's co-writers for some '80s rock classics.