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.
Duran Duran's "Wild Boys" is based on the book of the same name by William Burroughs.
Will.I.am, literally dreamt up "I Gotta Feelin'." Said the Black Eyed Pea: "Have you ever had a dream where there's a melody in your dream? I'll wake up out of my sleep and record that! 'I Gotta Feelin' was one of those songs."
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.
Katherine Heigl played Josh Kelley's love interest in the video for his 2005 song "Only You." They met on the shoot, became a real-life couple, and got married two years later. That's good casting!
Vegetarian Fred Schneider of the B-52's got the idea for "Rock Lobster" at an Atlanta disco when a projector displayed images of lobsters on a grill.
Dean's saga began with "Ariel," a song about falling in love with a Jewish girl from New Jersey.
Richie talks about producing the first two Kiss albums, recording "Brother Louie," and the newfound appreciation of his rock band, Dust.
When Judd Apatow needed under-appreciated rockers for his Knocked Up sequel, he immediately thought of Parker, who just happened to be getting his band The Rumour back together.
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."
The "A Thousand Miles" singer on what she thinks of her song being used in White Chicks and how she captured a song from a dream.
The hitmaking songwriter/producer Sam Hollander with stories about songs for Weezer, Panic! At The Disco, Train, Pentatonix, and Fitz And The Tantrums.