Drums - the drummer from Green Day.
Tre Cool (or, Frank Dwight III if you so choose)
Vocals: Emily Whitehurst (The Action Design, ex-Tsunami Bomb, also keyboards), Danzig
Guitars: Jerry Chang (arranged Canon Rock), Matt Bellamy (Muse, also vocals), Mick Jones (ex-Clash), Billie Joe Armstrong (Green Day... need those 4 power chord riffs, y'know. he can also fill in on some other instruments like saxes and mandolins)
Bass: Matt Freeman (Rancid)
Drums: Travis Barker
Bagpipes: Scruffy Wallace (Dropkick Murphys)
Fiddle: Bridget Reagen (Flogging Molly)
with a guest appearance by Strong Bad. you read that right.
also, mandatory covers include Still Alive, Charlene (I'm Right Behind You), and Never Gonna Give You Up.