I foolishly posted this in modern rock before so I'll try again somewhere more appropriate! What have been the worst comebacks/reunions of bands/artists?
the worst comeback would definitely have to go to the renewal of this thread...

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A few years ago, on Sirius Radio, they played one of the first shows that Motley Crue did when they returned. Vince Neil sounded absolutely like ass. I think he's gotten better though.

I've heard that Dokken doesn't have the pipes he used to.

Having seen Heaven and Hell a couple years back and Iron Maiden Last year, I can definitley say Dickinson and Dio can still wail.
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Once, I had just finished, and my dad knocks, walks in, and says "Wow, smells like chicken in here."