Question: Sigh, is a Japanese extreme metal band from Tokyo, formed in which year, and are credited as being one of the first Japanese black metal bands, producing music in the early 1990s when the majority of black metal came from Scandinavia, a historical and cultural region in Northern Europe characterized by a common ethnocultural North Germanic heritage and mutually intelligible North Germanic languages?
Sentence (from "Emperor Magus Caligula"): He has also performed backing vocals for the Swedish black metal band Sportlov.
Relevant evidence: No