A short list of bands that sing in rare, extinct or indigenous languages
Old Church Slavonic: Батюшка (Batushka)
Old Saxon: Menhir
Gaulish: Eluveitie
Old Norse: Skáld
Te Reo Māori: Alien Weaponry
Samoan: Shepherds Reign
Khakas and Chulyms: Otyken

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seen from Croatia

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seen from Malaysia

seen from Angola
A short list of bands that sing in rare, extinct or indigenous languages
Old Church Slavonic: Батюшка (Batushka)
Old Saxon: Menhir
Gaulish: Eluveitie
Old Norse: Skáld
Te Reo Māori: Alien Weaponry
Samoan: Shepherds Reign
Khakas and Chulyms: Otyken