Katy Perry says her 2008 song "Ur So Gay" is about "guys who wear the guyliner, steal your jeans, and that whole almost hipster emo scene."
"Baby Got Back" isn't just a booty song: it's about "Lack of acceptance by Hollywood of the African-American body."
Ronnie Spector nailed the vocal for The Ronettes song "(Walking) In the Rain" on the first take -- unheard of in the perfectionist producer Phil Spector's world.
Roger Daltrey stutters the vocal on "My Generation" by The Who. The idea was to sound like a British kid on speed.
Pete Townshend wrote the lyrics for "My Generation" during a train ride from London to Southampton on his 20th birthday.
A talented lyricist, Philip helped revive Neil Sedaka's career with the words to "Laughter In The Rain" and "Bad Blood."
The renown Texas songwriter has been at it for 40 years, with tales to tell about The Flatlanders and The Clash - that's Joe's Tex-Mex on "Should I Stay or Should I Go?"
Fagen talks about how the Steely Dan songwriting strategy has changed over the years, and explains why you don't hear many covers of their songs.
Guitarist Tony Iommi on the "Iron Man" riff, the definitive Black Sabbath song, and how Ozzy and Dio compared as songwriters.
The trail runs from flying saucer songs in the '50s, through Bowie, blink-182 and Katy Perry.
Medley looks back on "Unchained Melody" and "You've Lost That Lovin' Feelin'" - his huge hits from the '60s that were later revived in movies.