Pitbull is the lead artist on his Kesha collaboration "Timber," a #1 hit in 2014, but he only raps for about a minute on the song - Kesha does most of the work.
"Stay" by Lisa Loeb was the first #1 hit by an unsigned artist. It got a boost from Ethan Hawke, who got it into a movie he starred in called Reality Bites.
Ellie Goulding's hit song "Lights" is about her fear of the dark, which forces the singer to sleep with the lights on.
Michael Jackson wrote the Diana Ross hit "Muscles," which he named after his pet boa constrictor.
"Tammy" by Debbie Reynolds was the only US #1 single by a female act between July 1956 and February 1958.
"Rhythm Of My Heart" by Rod Stewart is about a soldier at war - his heart is beating like a drum because he's in battle.
Writing with Phil Lynott, Scott saw their ill-fated frontman move to a darker place in his life and lyrics.
He wrote "She Blinded Me With Science" so he could direct a video about a home for deranged scientists.
From the lake in "Roundabout" to Sister Bluebird in "Starship Trooper," Jon Anderson talks about how nature and spirituality play into his lyrics for Yes.
"25 or 6 to 4" to "Semi-Charmed Life" - see if you can spot the songs that are really about drugs.
The leader of the Modern A Cappella movement talks about the genre.
The renown rock singer talks about "The House of the Rising Sun" and "Don't Let Me Be Misunderstood."