Metallica and Lou Reed's 'Lulu': Listen to the preview here!
Coldplay's Chris Martin on 'Princess of China' guest Rihanna: 'She's a much, much better singer than me'
Taylor Swift duets with Usher, T.I. during all-star sweep through Atlanta: Watch here
John Stamos and Bob Saget teach us how to cuddle
'SNL' star Will Forte joins Guster onstage, can sing (!): Watch it here