"All I Want For Christmas Is You" by Mariah Carey was the first ringtone certified Gold.
"Girl Crush" by Little Big Town came from the hashtag #girlcrush, which its co-writer, Lori McKenna, spotted on Instagram.
If you have a whole day to kill, you can check out the full version of Pharrell Williams' "Happy" music video, the world's first 24-hour music video.
"Cigarettes And Chocolate Milk" describes a time in Rufus Wainwright's life when he found himself hungover and pounding chocolate milk to feel better. It didn't work, so he smoked a cigarette, which is when he realized his addictive personality could be a problem.
Michael Jackson's "Human Nature" was written by the keyboard player from Toto, who was working on the Thriller album.
"Feel Good Inc." by Gorillaz is a satire on the corporate music industry that cranks out "feel-good" music simply for profit.
A drummer for one of the most successful metal bands of the last decade, Chris talks about what it's like writing and performing with Slipknot. Metal-neck is a factor.
A Soul Train dancer takes us through a day on the show, and explains what you had to do to get camera time.
The Stax legend on how he cooked up "Green Onions," the first time he and Otis Redding saw hippies, and if he'll ever play a digital organ.
Petula talks about her hits "Downtown" and "Don't Sleep In The Subway," and explains her Michael Jackson connection.
Martyn talks about producing Tina Turner, some Heaven 17 hits, and his work with the British Electric Foundation.
Dean wrote the screenplay and lyrics to all the songs in Footloose. His other hits include "Fame" and "All The Man That I Need."