Before he was the champ, Ali released an album called I Am The Greatest!, but his musical influence is best heard in the songs he inspired.
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.
After studying in Paris with a famous composition teacher, Charles became the most successful writer of TV theme songs.
One of the most dynamic bass player/songwriters of his time, Chris is the only member of Yes who has been with the band since they formed in 1968.
The Evanescence frontwoman on the songs that have shifted meaning and her foray into kids' music.
A top country songwriter, Barry talks about writing hits for Little Big Town, Tim McGraw and Jason Aldean.
"Human" by The Killers was the most streamed song on Spotify in 2008, the year that the music streaming service was launched.
The lyrics for "Mary, Did You Know?" were written by Christian singer and comedian Mark Lowry, after his pastor asked him to write a Christmas musical for their church. Southern gospel musician Buddy Greene later added music to his words.
David Byrne says "Road To Nowhere" is about "how there's no order and no plan and no scheme to life and death and it doesn't mean anything, but it's all right.
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.
Icona Pop considers "I Love It" a kiss-off to their boyfriends: "we just wanted to get the song out and get the pigs to hear it," Jawo said.
In 1997, the Pope quoted the Bob Dylan song "Blowin' In The Wind."