The Whitney Houston hit "I Have Nothing" was inspired by Elvis Presley, who dated the song's lyricist, Linda Thompson.
"Pink Cadillac" was a B-side for Bruce Springsteen in 1984, but after Aretha Franklin sang about pink Cadillacs on "Freeway Of Love" the following year, Natalie Cole covered the song and had a hit with it in 1988.
Adele isn't a ghost when she sings, "Hello from the other side" - it means the "other side of becoming an adult."
"After Midnight" was written by the Oklahoma guitarist J.J. Cale, who was dirt poor until Eric Clapton recorded his song and turned it into a hit.
Desmond Child thought Gavin Rossdale was singing "Kiss The Rain" on the Bush song "Glycerine." When he found out the truth, he wrote a song called "Kiss The Rain" for Billie Myers.
Lil Wayne does an unlikely rap in a remix of the Joe Jonas song "Just In Love." The pair met at the 2008 MTV Video Music Awards.
The Guns N' Roses rhythm guitarist in the early '90s, Gilby talks about the band's implosion and the side projects it spawned.
Glen Ballard talks about co-writing and producing Alanis Morissette's Jagged Little Pill album, and his work with Dave Matthews, Aerosmith and Annie Lennox.
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."
"25 or 6 to 4" to "Semi-Charmed Life" - see if you can spot the songs that are really about drugs.
The Sevendust frontman talks about the group's songwriting process, and how trips to the Murder Bar helped forge their latest album.
A renowned guitarist and rock revivalist, Dave took "I Hear You Knocking" to the top of the UK charts and was the first to record Elvis Costello's "Girls Talk."