Legend and the Roots recorded Arcade Fire's anthem for their LP Wake Up!, but it didn't make the cut. This live version suggests why: Legend's vocals miss Win Butler's cracked frailty, and the groove refuses to swing. But it's cool to hear the song becoming a 21st-century standard.

Video: The Roots and John Legend on Their Soul LP 'Wake Up'

“Karma Chameleon”

Boy George has said this song was about standing by what you believe in. However, at the time, he was involved in a secret affair with Culture Club drummer Jon Moss. "Now people can understand the songs better," he said. "They were written about my relationship with Jon, and they were also written about being a gay man in a homophobic world." The lines "If I listen to your lies, would you say/I'm a man without conviction/I'm a man who doesn't know how to sell a contradiction," described his life at the time, he said. "I was selling this big lie."