Taliwakker
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i'm pretty sure the rivalry is derived from the fans and is essentially non-existant between the bands themselves....
It actually started cause MJR said to a friend that Portnoy looked like a hairy lesbian on the back of the Images and Words cd cover....word got back to MP and it began....Portnoy said in an interview that MJR sounds sounds like a cross between Yngwie and Brian May and looks like he ate both of them too.