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 "Sigh (band)"): They gradually shifted from a traditional extreme metal sound to a more experimental, avant-garde style employing symphonic elements.
Relevant evidence: No