Sia Furler originally sent "Pretty Hurts" to Katy Perry, but she didn't see the email, so Beyonce ended up recording it instead.
Don't play "I Will Always Love You" at your wedding - Dolly Parton wrote it about leaving someone behind to strike out on her own.
The hit duet "Somewhere Out There" was written for an animated film about a family of immigrant mice who lose one of their young.
Musically, the Twisted Sister song "We're Not Gonna Take It" is based on the Christmas tune "O Come All Ye Faithful."
"Peg" by Steely Dan is told from the perspective of Peg's jilted ex-boyfriend as he watches her launch an acting career.
Ronnie Van Zant wrote the Lynyrd Skynyrd classic "Gimme Three Steps" after making the mistake of dancing with a girl whose boyfriend was in the bar and probably had a gun. He asked for a 3-step head start.
These overtly religious songs crossed over to the pop charts, despite resistance from fans, and in many cases, churches.
Even before Soundgarden wrote a song about him, Artis was the most famous spoon player of all time. So why has he always been broke?
We ring the Hell's Bells to see what songs and rockers are sincere in their Satanism, and how much of it is an act.
Ozzy biting a dove? Alice Cooper causing mayhem with a chicken? Creed so bad they were sued? See if you can spot the real concert mishaps.
Just like Darrin was replaced on Bewitched, groups have swapped out original members, hoping we wouldn't notice.
If you can recall the days when MTV played videos, you know that there are lots of stories to tell. See if you can spot the real ones.