The actor Dan Aykroyd sang on "We Are The World." LaToya Jackson did too, so we know they weren't all that picky.
Bob Dylan was little known when he released "Blowin' In The Wind" so the cover versions - especially by Peter, Paul and Mary and Stan Getz - were much more popular at the time.
On the surface, "Summer Breeze" by Seals & Crofts is just a song about a guy coming home from work, but the duo claimed it had a deeper meaning about finding direction in one's personal life.
One of the first hit songs used in a major marketing campaign was "Start Me Up" by The Rolling Stones. Microsoft paid $3 million to use it in commercials for Windows '95.
The first line of "Papa Was A Rollin' Stone" is "It was the 3rd of September," which is the day lead singer Dennis Edwards' father died.
"Zombie" by The Cranberries is about an IRA bombing in England that killed two children.
Richard explains how Joe Walsh kickstarted his career, and why he chose Hazard, Nebraska for a hit.
He wrote "She Blinded Me With Science" so he could direct a video about a home for deranged scientists.
Kevin Godley talks about directing classic videos for The Police, U2 and Duran Duran, and discusses song and videos he made with 10cc and Godley & Creme.
Elvis, Little Richard and Cheryl Cole have all sung about Teddy Bears, but there is also a terrifying Teddy song from 1932 and a touching trucker Teddy tune from 1976.
Deep Purple's guitarist since 1994, Steve talks about writing songs with the band and how he puts his own spin on "Smoke On The Water."
How a goofy detective movie, a disenchanted director and an unlikely songwriter led to one of the biggest hits in pop history.