The song "Grease," sung by Frankie Valli in the 1978 movie, was written by Barry Gibb of The Bee Gees.
John Legend wrote "All Of Me" about his fiancée Chrissy Teigen. He sang it to her at their wedding ceremony in Como, Italy.
Sia planned to quit her solo career after her 2014 album 1000 Forms of Fear, but the "Chandelier" video proved so popular it drew her back in.
An unknown Ke$ha sang on Flo-Rida's #1 hit "Right Round," but refused to appear in the video because she wanted to make a name for herself.
Paul McCartney wrote "Blackbird" in Scotland after reading about race riots in the U.S. when federal courts forced the racial desegregation of the Arkansas capital's school system.
When "Last Friday Night (T.G.I.F.)" climbed to #1 on the Hot 100, Katy Perry became the first woman to send five songs from one album to the top of the charts. The four previous chart-toppers from her Teenage Dream set were "California Gurls," "Teenage Dream," "Firework"; and, "E.T."
These overtly religious songs crossed over to the pop charts, despite resistance from fans, and in many cases, churches.
The guitarist/songwriter explains how he came up with his signature sound, and deconstructs some classic Fear Factory songs.
Dwarfs on stage with an oversize Stonehenge set? Dabbling in Satanism? Find out which Spinal Tap-moments were true for Black Sabbath.
Phone booths are nearly extinct, but they provided storylines for some of the most profound songs of the pre-cell phone era.
Justin wrote the classic "Nights In White Satin," but his fondest musical memories are from a different decade.
Waters tells the "Gypsy Woman" story, shares some of her songwriting insights, and explains how Dennis Rodman ended up on one of her songs.