If Dave, Krist and Courtney weren't angry enough, it looks like the new ability to import Band Hero songs into Guitar Hero 5 is going to push them over the edge. In this latest clip, a player has the late Kurt Cobain join the late Johnny Cash to sing the disco hit, "YMCA." Later, Kurt is used to play the Spice Girls' "Wannabe."

Kurt and Johnny Cash sing "YMCA"

Kurt sings "Wannabe"