I always get a kick out of which genres Bathory gets labeled. Do we go with where it started, where it ended, go by specific album, or just throw a dart and see what comes up? :)
I'm not objecting to the Viking metal label at all, though others might. It's that you can play "their" discography and meander across multiple genres/sub genres. Hell, if you pick albums that are far enough apart, you might not even realize it's the same band (and, being real, it isn't always the same band lol).