Madonna's "Justify My Love" was co-written by Lenny Kravitz.
Roger Daltrey stutters the vocal on "My Generation" by The Who. The idea was to sound like a British kid on speed.
Lucinda Williams wrote and recorded "Passionate Kisses" 4 years before it was a hit for Mary Chapin Carpenter.
"Veronica" was inspired by Elvis Costello's grandmother, who suffered from Alzheimer's disease.
Jay-Z's "Hard Knock Life (Ghetto Anthem)" is based on the song "It's A Hard Knock Life" from the Broadway play Annie.
The Pretenders are named after the 1956 song "The Great Pretender" by The Platters.
He wrote "She Blinded Me With Science" so he could direct a video about a home for deranged scientists.
The Jayhawks' song "Big Star" has special meaning to Gary, who explains how longevity and inspiration have trumped adulation.
"25 or 6 to 4" to "Semi-Charmed Life" - see if you can spot the songs that are really about drugs.
Into the vaults for this talk with Bolton from the '80s when he was a focused on writing songs for other artists.
We've heard of artists putting their hearts into their music, but some take it literally.
Scott was Stevie Wonder's bass player before becoming a top session player. Hits he played on include "I Will Survive," "Being With You" and "Sara Smile."