Ariana Grande's hit "Problem" started off as a track written by One Direction songwriter Savan Kotecha. He gave it the working title of "The Whisper Song," after a 2005 Ying Yang Twins hit.
George Michael was 17 and on a bus to his job at the cinema when he came up with the idea for "Careless Whisper" and the lyrics, "Something in your eyes calls to mind a silver screen."
"Personal Jesus," a song about "being a Jesus for somebody else," was inspired by Elvis and Priscilla Presley.
"Baby One More Time" was originally offered to TLC but they passed on it. The R&B trio felt uncomfortable singing "'hit me baby one more time."
The video for Iggy Azalea's "Fancy" pays homage to the classic 1995 film Clueless with the rapper playing Cher and featured singer Charli XCX portraying Tai. It was filmed at some of the same locations used in the movie.
Paul Stanley and Gene Simmons of Kiss wrote "Rock And Roll All Nite" as a "rallying cry for all of our fans." In later years, members of Kiss wrote songs separately.
Does he have beef with Gaga? Is he Sean Lennon's godfather? See if you can tell fact from fiction in the Elton John edition.
The Red Hot Chili Peppers have some rather unusual song titles - see if you can spot the real ones.
On Glen's résumé: hit songwriter, Facebook dominator, and member of Styx.
The "All I Want" singer went through a long depression, playing some shows when he didn't want to be alive.
"Mr. Jones" took on new meaning when the song about a misguided view of fame made Adam famous.
