Mostly English, some Finnish, Norwegian, German and Japanese, bit of Russian, Korean and Mongolian, and the others I can't recall at the moment.
English, German, and a little bit of Russian.
Five:
Russian - folk; hardstyle German - operatic; psychobilly Italian - operatic; English - multiple; Finnish - folk metal
Croatian English German Polish and various other Eastern European languages Spanish (European, not mexicoons)
at least two
Mostly the language of music (non-vocal). A good amount of English, a lot of Japanese, a few German.
English German Japanese and a little French
6
Danish Icelandic German English Russian Old Norse (as in the poetic Eddas, etc., similar to modern Icelandic)
6
American French German Russian Serbian Greek
I tried finding some good Nordic metal bands but that black metal stuff is just too goofy for me.
4
5 if you consider ebonics to be a separate language
Delete that #5 shit immediately.
I counted 16 English (american, british, irish, australian variants), german, russian, mandarin, mongolian, japanese, korean, kazakh, hunarian, arabic, french, zulu, hindi, jamaican, ebonic, and last as well as least kikespeak but only 1 song of that cuz the music video makes me laugh, it's funny cuz the singer is fat and keeps turning into a rhino