Call it the ultimate music mix: At the Grammys in L.A., the Jonas Brothers got funkadelic with Stevie Wonder; Sir Paul rocked with the Foo Fighters' Dave Grohl; and Taylor Swift sang an acoustic "Fifteen" with pal Miley Cyrus
. But most amazing? With less than three hours to prep, Al Green and Justin Timberlake
delivered "Let's Stay Together" (replacing Rihanna
's performance—see page 52). "[I was] in the shower and they said, 'Whatever you have, throw it in the bag and come on,'" said Green, who, like JT, is from Memphis. "That's what we do!"