I was wondering how long it'd be before Black Metal came up. There's a definite fash undercurrent there, and I try to avoid it so I can't give many examples but Varg Vikernes the convicted murderer is definitely a good example (he says he's 'moved away from' Nazism but you know .. they always say that)
NSBM (National Socialist Black Metal) is definitely a thing, sad to say. Some of those guys think they have to be nazi or at least sympathetic, in order to be true to their pagan roots and culture (which is a
far more important aspect to black metal). BM is notoriously anti-religious, and the religions that are especially hated are christianity, islam and judaism - for a lot of reasons, some of which for them verge on (or are actually) racist and antisemitic.
http://en.wikipedia.org/wiki/National_Socialist_black_metal
Anyway, ETA, this kind of thing is largely limited to scandinavia, though it's fair to say that there are racists who like all kinds of music and the various genres and subgenres of metal are certainly not immune - unsurprising, when you consider how popular metal is globally, as an artform.