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."
A gospel choir appears in Sam Smith's "Stay With Me" video, but the vocals on the song are all Smith - about 20 tracks of his voice were used to make him sound like a chorus.
"I Just Called To Say I Love You" is Stevie Wonder's best-selling single worldwide. It topped the Hot 100, AC, R&B and UK charts all in the same week.
The Cure's "Lullaby" is based on a recurring nightmare frontman Robert Smith had as a child where he was eaten by a giant spider.
Kid Rock performed his song "Amen" at Barack Obama's inaugural, but claims he didn't vote for him.
Thomas Dolby wrote "She Blinded Me With Science" so he could direct the video, which was inspired by silent films and set in a "home for deranged scientists."
Does he have beef with Gaga? Is he Sean Lennon's godfather? See if you can tell fact from fiction in the Elton John edition.
"Mr. Jones" took on new meaning when the song about a misguided view of fame made Adam famous.
Rufus Wainwright on "Hallelujah," his album Unfollow The Rules, and getting into his "lyric trance" on 12-hour walks.
Have you got the smarts to know which of these graduation song stories are real?
The rock revolutionist on songwriting, quitting smoking, and what she thinks of Rush Limbaugh using her song.
Deep Purple's guitarist since 1994, Steve talks about writing songs with the band and how he puts his own spin on "Smoke On The Water."