Willa Ford came up with her hit "I Wanna Be Bad" when her record company told her to tone down her music in a effort to differentiate her from Britney Spears and Christina Aguilera, who were in their "bad girl" eras.
Billy Joel's song "Allentown" was written as "Levittown," which is the town in Long Island where he grew up. He got the idea to change it after taking a trip to Pennsylvania.
An unknown Kesha (known then as Ke$ha) sang on Flo-Rida's #1 hit "Right Round," but refused to appear in the video because she wanted to make a name for herself.
Taio Cruz throws his hands up "sometimes" in "Dynamite" because the song was originally written about surrender.
Otis Day And The Knights, the fictional band created to perform "Shout" in the movie Animal House, became a real band, performing the song at colleges and other venues.
"Coming Home" by Diddy - Dirty Money was written for for T.I., who was getting out of prison at the time.
Just like Darrin was replaced on Bewitched, groups have swapped out original members, hoping we wouldn't notice.
Bridesmaids, Reservoir Dogs, Willy Wonka - just a few of the flicks where characters discuss specific songs, sometimes as a prelude to murder.
Jim talks about the impact of "The Middle" and uses a tree metaphor to describe his songwriting philosophy.
A talented lyricist, Philip helped revive Neil Sedaka's career with the words to "Laughter In The Rain" and "Bad Blood."
Cain talks about the divine inspirations for "Don't Stop Believin'" and "Faithfully."
Here's what happens when an opening act is really out of place with the headliner, like when Beastie Boys opened for Madonna.