Christina Perri's "Jar Of Hearts," written about her ex, became a big hit after it was used in a routine on So You Think You Can Dance.
Psy's "Gangnam Style" refers to a section of Seoul, South Korea, that is very fashionable. The guy in the song has all the right moves and loves the ladies.
A problem with his eyes gave Jackson Browne the idea for "Doctor My Eyes," which became a song about a man whose mental health suffers when he sees the world for what it really is.
Meghan Trainor and her producer Kevin Kadish wrote "All About That Bass" for another artist to record, but after Epic Records boss LA Reid heard Meghan play a demo of the song on a ukulele, he signed her to his label and told her she should sing it.
The first hit song that was used in a commercial before it was released as a single was "I'd Like To Teach The World To Sing," which was written for a Coke ad.
When Keith Urban played "Somebody Like You" for his girlfriend, she called him a hypocrite because he "sucked at relationships."
Dean's saga began with "Ariel," a song about falling in love with a Jewish girl from New Jersey.
Switchfoot's frontman and main songwriter on what inspires the songs and how he got the freedom to say exactly what he means.
An interview with Frankie Valli, who talks about why his songs - both solo and with The Four Seasons - have endured, and reflects on his time as Rusty Millio on The Sopranos.
The "A Thousand Miles" singer on what she thinks of her song being used in White Chicks and how she captured a song from a dream.
"Come On Eileen" was a colossal '80s hit, but the band - far more appreciated in their native UK than stateside - released just three albums before their split. Now, Dexys is back.
Some songs get a second life when they find a new audience through a movie, commercial, TV show, or even the Internet.