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 biggest hit of 2015 was "Uptown Funk," a collaboration between Bruno Mars and guitarist/producer Mark Ronson. Ronson says making it took "six or seven months of chasing Bruno around on tour."
The "Don't Stop Believin'" resurgence started when the Journey song was used in a roller skating scene of the 2003 movie Monster.
John Lennon got the title of the Beatles song "Happiness Is A Warm Gun" from an article in a magazine published by the National Rifle Association.
Bernie Taupin was 17 when he wrote the lyrics to Elton John's "Your Song." Looking back, he says it's "one of the most naïve and childish lyrics in the entire repertoire of music."
The first single to simultaneously top the UK and US charts was The Everly Brothers' "Cathy's Clown" in May 1960.
Justin wrote the classic "Nights In White Satin," but his fondest musical memories are from a different decade.
Steppenwolf frontman John Kay talks about "Magic Carpet Ride," "Born To Be Wild," and what he values more than awards and accolades.
Nick made some of the biggest videos on MTV, including "The Final Countdown," "Heaven" and "Don't Know What You Got (Till It's Gone)."
You may not recognize his name, but you will certainly recognize Peter Lord's songs. He wrote the bevy of hits from Paula Abdul's second album, Spellbound.
Can you be married in one country but not another? Only if you're part of a gay couple. One of the first famous singers to come out as a lesbian, Janis wrote a song about it.
The 10 biggest "retirement tours" that didn't take.