Madonna feat. Timbaland and Justin Timberlake: "4 Minutes to Save the World"

Madonna has taken on many identities during her career, but "hook girl" has never made her résumé – until now. With Timbaland's thick, clanging beat in command of the first single from the forthcoming Hard Candy, her vocal competes with a blaring marching-band horn rift as she trades lines with the song's co-writer, Justin Timberlake. The track's urgent urban thump never hits a peak, but it's a heater all the same, and it demonstrates Madonna's newest party trick: sharing the spotlight.

This story is from the April 3rd, 2008 issue of Rolling Stone.