I don't use Spotify, i'm using Youtube, but sometimes soundcloud, niconicodouga for japanese songs, mixcloud... well for DJ mix, a few metal songs over there.
COOL, i WILL HAVE TO REMEBER THE jAPANESE ONE YOU MENTIONED--i LIKE JAPANESE METAL, I LIKE THE WHOLE jAPANESE CULTURE...
https://www.nicovideo.jp/