Hellstone has collaborated with large variety of artists from doom metal to classical music. Here are artists and events, to name a few: Superfjord (FIN), Pohjonen Alanko (FIN), Rainbowlicker (FIN), Positive Wave (FIN), Radiopuhelimet (FIN), Risto (FIN), Sinai (FIN), Pariisin Kevät (FIN), Warning (UK), Weepies (FIN), Wigwam Revisited (FIN), Usnea (US), U.F.Ojala (FIN),...