Gwen Stefani wrote "Just a Girl" as a message to her overprotective father.
"Irreplaceable" wasn't specifically penned for Beyonce - in fact, Ne-Yo wrote it more as a country song and had Faith Hill and Shania Twain in mind.
"Airplanes" by B.o.B was written by Lupe Fiasco, who recorded it but decided to pass.
"Free Fallin'" by Tom Petty is set in Los Angeles, as he mentions Reseda, Mulholland and Ventura Boulevard.
Bruce Springsteen originally wrote "Hungry Heart" for The Ramones, but decided to keep it for himself on the advice of his producer and manager, Jon Landau.
"All I Want For Christmas Is You" by Mariah Carey was the first ringtone certified Gold.
The author of Help! 100 Songwriting, Recording And Career Tips Used By The Beatles, explains how the group crafted their choruses so effectively.
The Red Hot Chili Peppers have some rather unusual song titles - see if you can spot the real ones.
Michelob commercials generated hits for Eric Clapton, Genesis and Steve Winwood in the '80s, even as some of these rockers were fighting alcoholism.
They sang about pink torpedoes and rocking you tonight tonight, but some real lyrics are just as ridiculous. See if you can tell which lyrics are real and which are Spinal Tap in this lyrics quiz.
The 10 biggest "retirement tours" that didn't take.
On Glen's résumé: hit songwriter, Facebook dominator, and member of Styx.