I'd rather see him with Scotty Moore and DJ Fontana , again , but , that's just me.
I think the thing is , they're trying to raise as much money as possible for Hurricane Sandy victims , so , they're putting together the biggest names possible to drum up more attention.
I guess someone figured , if McCartney and the two surviving members of Nirvana (Excluding Pat Smear.) were available , separately , to perform , why not have them perform together?
OK , The fact that Paul copped to not knowing who they were , I guess , is a big why not.
But , there was no way they were going to let them do this without a superstar frontman at the wheel. Greg Sage would make sense , if on a smaller scale , but , people want names. We know him , but most people don't.