Chaka Khan's hit "I Feel For You" was written and originally recorded by Prince four years before she covered it.
Katy Perry co-wrote Iggy Azalea's hit single "Black Widow." Perry was originally going to sing on the track, but she couldn't fit it into her schedule, so Rita Ora provided the sung vocals instead.
The Four Tops' "I Can't Help Myself (Sugar Pie Honey Bunch)" was written by the Motown team of Lamont Dozier, Brian Holland and Eddie Holland. The phrase "Sugar pie, honey bunch" was something Dozier's grandfather used to say when he was a kid.
"Rockin' In The Free World" is a very pro-America title, but the song takes on politicians who are indifferent to the poor and disenfranchised.
Psy's "Gangnam Style" refers to a section of Seoul, South Korea, that is very fashionable. The guy in the song has all the right moves and loves the ladies.
Feist's "1234" is "about lost love, and the hope to recapture what you once had," but it's best known for the Sesame Street version about counting to four.
Cain talks about the divine inspirations for "Don't Stop Believin'" and "Faithfully."
Are classic songs like "Over The Rainbow" and "Take Me Out to the Ballgame" in the public domain?
Nick made some of the biggest videos on MTV, including "The Final Countdown," "Heaven" and "Don't Know What You Got (Till It's Gone)."
Did this Eagle come up with the term "Parrothead"? And what is it like playing "Hotel California" for the gazillionth time?
It took him seven years to recover from his American hit "Fool (If You Think It's Over)," but Chris Rea became one of the top singer-songwriters in his native UK.
Martyn talks about producing Tina Turner, some Heaven 17 hits, and his work with the British Electric Foundation.