The chant in the Bruno Mars/Rosé hit "APT" is "apateu," the Korean word for apartment. It's named after a Korean drinking game called "Apartment" that Rosé told Bruno about.
Rihanna was Pitbull's first choice to sing on "Timber," but she wasn't available at the time so he enlisted his RCA labelmate Kesha instead.
The title of Florence + the Machine's "How Big, How Blue, How Beautiful" was inspired by the Los Angeles skyline.
Don Johnson, who starred as Sonny Crockett in Miami Vice, was also a singer. He had a #5 hit in 1986 with "Heartbeat."
KT Tunstall's "Suddenly I See" was inspired by Robert Mapplethorpe's photograph of Patti Smith on the cover of her album Horses.
"Take On Me" was just a minor hit in Norway until a new version was released with the iconic video, making it a global smash.
Was "Pearl" Eddie Vedder's grandmother, and did she really make a hallucinogenic jam? Did Journey have a contest to name the group? And what does KISS stand for anyway?
When a waitress wouldn't take him home, Jack wrote what would become one of the Eagles most enduring hits.
Graham Nash tells the stories behind some of his famous songs and photos, and is asked about "yacht rock" for the first time.
Dennis DeYoung explains why "Mr. Roboto" is the defining Styx song, and what the "gathering of angels" represents in "Come Sail Away."
The Red Hot Chili Peppers have some rather unusual song titles - see if you can spot the real ones.
Yngwie Malmsteen and Steve Vai were two of Graham's co-writers for some '80s rock classics.