 Keith Fay of the folk metal band Cruachan has also noted the influence of sea shanties on Viking metal , though rather disparagingly . In an interview with Terrorizer , he stated that " There is no real defined ' Viking music ' , so all these Nordic bands use ' sea shanty ' type tunes to match their music . A lot of these bands , especially the bigger ones , are called folk metal but they don 't really understand what real folk music is ; though I know this is not true for all of them . " 
