"Little Talks," released in 2011 during the folk-rock boom, was the big hit for the Icelandic group Of Monsters And Men. The song is delivered as a conversation between a longtime married couple, but the woman might be going crazy and talking to a ghost.
"Hips Don't Lie" is Shakira's in-studio mantra for her crew: If her hips are moving, the song is working. If not, best to try something else.
"Feel It Still" by Portugal. The Man deals with lead singer John Gourley becoming a "rebel just for kicks" after having a daughter and settling down. "It's hard to be a punk when you're thinking about your baby daughter at home," he says.
Feist's "1234" is "about lost love, and the hope to recapture what you once had," but it's best known for the Sesame Street version about counting to four.
Britney Spears was just 16 when her first single, "Baby One More Time," was released. She quickly became a top search term on something called The Internet.
You wouldn't know it from the upbeat melody, but "Walkin' On The Sun" by Smash Mouth is about the 1992 Los Angeles Riots.
When Judd Apatow needed under-appreciated rockers for his Knocked Up sequel, he immediately thought of Parker, who just happened to be getting his band The Rumour back together.
"25 or 6 to 4" to "Semi-Charmed Life" - see if you can spot the songs that are really about drugs.
Billie Jean, Delilah, Sara, Laura and Sharona - do you know who the girls in the songs really are?
Richie talks about producing the first two Kiss albums, recording "Brother Louie," and the newfound appreciation of his rock band, Dust.
The Christian rapper talks about where his trip to Haiti and his history of addiction fit into his songs.
How well do you know your protest songs (including the one that went to #1)?