A selection of songs made to be terrible - some clearly achieved that goal.
The outlaw country icon talks about the spiritual element of his songwriting and his Bob Dylan mention.
Iron Maiden, Adele, Toto, Eminem and Earth, Wind & Fire are just some of the artists with songs directly inspired by movies - and not always good ones.
Martyn talks about producing Tina Turner, some Heaven 17 hits, and his work with the British Electric Foundation.
Smith breaks down some of his worship tracks as well as his mainstream hits, including "I Will Be Here For You" and "A Place In This World."
Eddie (played by Johnny Depp in the video) found fame fleeting, but Chuck Berry's made-up musician fared better.
"Hips Don't Lie" is Shakira's in-studio mantra for her crew: If her hips are moving, the song is working. If not, best to try something else.
"Ghosttown" was Madonna's 45th chart-topper on the Dance Club Songs chart, breaking the record for the most #1s an artist has tallied on a single Billboard chart.
Robert Plant's "Heaven Knows" is a satirical look at the '80s, when style seemed to trump substance.
The video for Brad Paisley's "Online" is a mini-Seinfeld reunion, featuring Jason Alexander, Estelle Harris, and Patrick Warburton.
"Up Around The Bend" by Creedence Clearwater Revival had a different meaning to British listeners. In England, to go "Around the bend" means to go crazy.
Lily Allen wrote "Something's Not Right" for the soundtrack of the Peter Pan prequel, Pan. The song was inspired by the heartache that Allen experienced after suffering a miscarriage when she was six months pregnant with her first child by husband Sam Cooper in 2010.