When "Last Friday Night (T.G.I.F.)" climbed to #1 on the Hot 100, Katy Perry became the first woman to send five songs from one album to the top of the charts. The four previous chart-toppers from her Teenage Dream set were "California Gurls," "Teenage Dream," "Firework"; and, "E.T."
"Happy Xmas (War Is Over)" is based on billboards John Lennon and Yoko Ono posted two years earlier declaring "War Is Over! If You Want It."
The bedrock of David Guetta's Nicki Minaj-featuring single "Hey Mama" is a sample of "Rosie," a 1940s prison recording from folk archivist Alan Lomax that songwriter Esther Dean first showed the French DJ on YouTube.
Grazing In The Grass by The Friends Of Distinction was the first big hit to use the phrase "dig it" in the lyric.
"I'll Melt With You" by Modern English is about a couple who melt together because a nuclear bomb drops.
Bob Seger's "Beautiful Loser" was inspired by a book written by Leonard Cohen called Beautiful Losers.
Joe talks about the challenges of of making a Duke Ellington tribute album, and tells the stories behind some of his hits.
Elvis, Little Richard and Cheryl Cole have all sung about Teddy Bears, but there is also a terrifying Teddy song from 1932 and a touching trucker Teddy tune from 1976.
Dan cracked the Top 40 with "Ritual," then went to India and spent 2 hours with the Dalai Lama.
Test your metal - Priest, Maiden, and Beavis and Butt-head show up in this one.
The Jayhawks' song "Big Star" has special meaning to Gary, who explains how longevity and inspiration have trumped adulation.
Cain talks about the divine inspirations for "Don't Stop Believin'" and "Faithfully."