#Listening to Sakhalin, a 2010 album by Oki Dub Ainu Band, which;
"... features Tonkori, the traditional stringed instrument of the Karafuto Ainu in a band setting with drums, bass, keyboard and heavy dub sound."
https://okidub.bandcamp.com/album/sakhalin-rock
I presume some of the songs, like Bekabeka, are in an Ainu language too. Like a blend of Japanese and Pacific triangle languages, maybe even a little like some South American languages I've heard bits of.