We were all party rocking in 2011 with the global smash "Party Rock Anthem," but rap fans know the "Everyday I'm shufflin'" line is a take on "Everyday I'm hustlin'" from the 2006 Rick Ross track "Hustlin'."
Katy Perry's "Dark Horse" was co-written by Sarah Hudson, who was a member of the pop group Ultraviolet Sound. Though Sarah isn't related to Katy (whose real name is Katy Hudson), she is the first cousin of another famous person with the same name, the actress Kate Hudson.
There was only one Grammy ever given for Best Disco Recording. It went to "I Will Survive" by Gloria Gaynor.
"Man On The Moon" by R.E.M. is about the comedian Andy Kaufman, who often seemed like he was from another planet.
In 2010, the biggest-selling song in the UK was "Love the Way You Lie" by Eminem.
James Taylor wrote "Sweet Baby James" during a road trip to Virginia in honor of his brother’s new baby, also named James, whom he was about to meet for the first time.
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.
Roger tells the stories behind some of his biggest hits, including "Give a Little Bit," "Take the Long Way Home" and "The Logical Song."
What's the deal with "Summer of '69"? Bryan explains what the song is really about, and shares more of his songwriting insights.
Rufus Wainwright on "Hallelujah," his album Unfollow The Rules, and getting into his "lyric trance" on 12-hour walks.
At 80 years old, Yoko has 10 #1 Dance hits. She discusses some of her songs and explains what inspired John Lennon's return to music in 1980.
The Red Hot Chili Peppers have some rather unusual song titles - see if you can spot the real ones.