"Irreplaceable" wasn't specifically penned for Beyonce - in fact, Ne-Yo wrote it more as a country song and had Faith Hill and Shania Twain in mind.
A roadie for the Allman Brothers came up with the line "The road goes on forever" for "Midnight Rider," and got a songwriting credit for his contribution.
Lucinda Williams' track "Compassion" is based on a poem by her father, lauded Arkansas poet Miller Williams.
Bruce Springsteen originally wrote "Hungry Heart" for The Ramones, but decided to keep it for himself on the advice of his producer and manager, Jon Landau.
"Killing An Arab" by The Cure was inspired by Albert Camus' book The Stranger.
The sample in Beck's song "Where It's At" that says "What about those who swing both ways: AC-DC" came from a 1969 sex-ed album for middle schoolers.
A selection of songs made to be terrible - some clearly achieved that goal.
The stories behind "Whole Of The Moon" and "Red Army Blues," and why rock music has "outlived its era of innovation."
Was a Beatles song a TV theme? And who came up with those Fresh Prince and Sopranos songs?
A top country songwriter, Barry talks about writing hits for Little Big Town, Tim McGraw and Jason Aldean.
Does Angus really drink himself silly? Did their name come from a sewing machine? See if you can spot the real stories about AC/DC.