"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.
Richard Marx' debut single "Don't Mean Nothing" features Joe Walsh on guitar.
John Legend wrote "All Of Me" about his fiancée Chrissy Teigen. He sang it to her at their wedding ceremony in Como, Italy.
"Whip It" by Devo is about the rah-rah affirmations delivered by politicians and motivational speakers who often have ulterior motives.
In "I Walk The Line," Johnny Cash hums before each verse. He did this to get his pitch, as the song changes key several times.
Jimmy Webb was inspired to write The 5th Dimension song "Up-Up and Away" after seeing a hot-air balloon his friend flew on promotions for the Southern California radio station KMEN.
Was Justin the first to be Punk'd by Ashton Kutcher? Did Britney really blame him for her meltdown? Did his bandmates think he was gay?
Richie talks about producing the first two Kiss albums, recording "Brother Louie," and the newfound appreciation of his rock band, Dust.
From the cowbell on "Mississippi Queen" to recording with The Who when they got the wrong Felix, stories from one of rock's master craftsmen.
Not everyone can be a superhero, but that hasn't stopped generations of musicians from trying to be Superman.
Did they really trade their guitarist to The Doobie Brothers? Are they named after something naughty? And what's up with the band name?
The story of the legendary lupine DJ through the songs he inspired.