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Rock music and Halloween are pretty much the perfect combination — and perhaps that’s why Halloween concerts are famous for their debauchery. Once you have a band and audience in costume, all hell breaks loose. And for music geeks, it’s especially fun to see our favorite bands… dressed as other bands. Unfortunately, it just doesn’t happen often enough. After the jump, we round up our favorite examples, including everyone from Nirvana to Superchunk to Katy Perry dressed as icons from Elvis to… well, Nirvana.

Nirvana: Kurt Cobain as Barney and Pat Smear as Slash
The fact that Nirvana and Guns ‘n Roses were mortal enemies makes this cock rock send-up even more wonderful than it appears at first glance. Also: Kurt as Barney is the stuff nightmares are made of.