Elvis Presley recorded "Always On My Mind" in 1972, but Willie Nelson's version 10 years later was the hit and won the Song of the Year Grammy.
Rascal Flatts is one of those bands whose most famous song is a cover. "Life Is A Highway," which they recorded for the movie Cars in 2006, was written and originally released by Tom Cochrane in 1991.
Paul McCartney's favorite song that he wrote for someone else is Cilla Black's 1968 UK Top 10 hit "Step Inside Love."
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.
Beyonce Knowles and Michelle Williams wrote the Destiny's Child song "Girl" for Kelly Rowland as an encouragement for her to end her relationship with a verbally and physically abusive boyfriend.
"How To Save A Life" by The Fray was inspired by a teenager lead singer Isaac Slade mentored at a camp for troubled youth in Colorado.
Webb talks about his classic songs "By the Time I Get to Phoenix," "Wichita Lineman" and "MacArthur Park."
Taylor talks about "The Machine" - the hits, the videos and Clive Davis.
These Three famous songs actually describe how they were written - late into the evening.
"Come On Eileen" was a colossal '80s hit, but the band - far more appreciated in their native UK than stateside - released just three albums before their split. Now, Dexys is back.
The singer/bassist for Concrete Blonde talks about how her songs come from clairvoyance, and takes us through the making of their hit "Joey."
One of rock's top photographers talks about artistry in photography, raising funds for a documentary, and enjoying a County Fair with Tom Waits.