"Lean On" was originally sent by Major Lazer to both Rihanna and Nicki Minaj's camps as a slower reggae track. After both parties rejected the tune, Major Lazer recruited Danish singer MØ to supply vocals and they recorded it themselves.
Elton John had a huge hit duetting with Kiki Dee on "Don't Go Breaking My Heart," but he's also performed it with RuPaul and Miss Piggy.
Jay-Z was going to ask Mary J. Blige to duet on "Empire State of Mind," but he decided on Alicia Keys when he heard the piano stabs on the track.
The New Year's Eve favorite "Auld Lang Syne" is a Scottish song that roughly translates to "Days Of Long Ago."
Neil Diamond wrote "I'm A Believer" early in his career. It was a hit for The Monkees and revived by Smash Mouth in 2001 for the movie Shrek, helping make Diamond cool again.
Sir Mix-A-Lot says he's earned over $100 million from "Baby Got Back." He wrote the song and owns the publishing rights, so he can authorize its use in movies, TV shows and commercials, which he often does.
The Red Hot Chili Peppers have some rather unusual song titles - see if you can spot the real ones.
John Lennon, Paul Simon and Lynyrd Skynyrd are some of the artists who have written revenge songs. Do you know who they wrote them about?
Dean wrote the screenplay and lyrics to all the songs in Footloose. His other hits include "Fame" and "All The Man That I Need."
Rick has a surprising dark side, a strong feminine side and, in a certain TV show, a naked backside. But he still hasn't found Jessie's Girl.
Here's what happens when an opening act is really out of place with the headliner, like when Beastie Boys opened for Madonna.
