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Yeah, what tensho said. They're too big a band to only be considered "the guys who did ggxx ost". Not that there's any problem with that, but I also highly recommend everyone listen to all their albums, they're all awesome.
Most last.fm users are westerners, so it's only natural that most of the top tracks are from the Korean version of Guilty Gear XX since most of them would've only heard of them 'cause they're Guilty Gear fanboys :p