The guys from Chic wrote "Le Freak" as a message to a doorman who wouldn't let them into a club. Originally, it was "F--- Off."
Ricky Martin's "Livin' La Vida Loca" was the first #1 hit created entirely in Pro Tools.
"Cotton Eye Joe" is a folk song dating to the 1800s, but it became a hit when a Swedish act called Rednex did a psychokinetic version in 1994.
"What's Up" by 4 Non Blondes has endured as one of the most popular songs of the '90s, but it wasn't a huge hit at the time and the band split after one album. Frontwoman Linda Perry went on to write hits for Pink and Christina Aguilera.
Eric Clapton wrote "Layla" about his love for Pattie Harrison, who was married to George Harrison at the time. He eventually married Pattie, and managed to stay friends with George.
Kesha (known at the time as Ke$ha) was still pretty wild when she released her song "Crazy Kids" in 2012. It's about one of her birthday parties that got a little out of hand.
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."
Todd Rundgren explains why he avoids "Hello It's Me," and what it was like producing Meat Loaf's Bat Out of Hell album.
How well do you know your protest songs (including the one that went to #1)?
"Mr. Jones" took on new meaning when the song about a misguided view of fame made Adam famous.
At 80 years old, Yoko has 10 #1 Dance hits. She discusses some of her songs and explains what inspired John Lennon's return to music in 1980.
Billie Jean, Delilah, Sara, Laura and Sharona - do you know who the girls in the songs really are?