[unknown] (Special Purpose Artist - Do not add releases here, if possible.)
This is a Special Purpose Artist and primarily a place holder for tracks with an unknown artist on Various Artists releases.
Do not add albums here unless, after extensive research, you still cannot determine who the artist is.
Do not use it as a dumping ground for releases that you are too lazy to look up.
Most soundtracks are Various Artists albums, and should be entered as such. The few that are not should be listed under the soundtrack composer(s), not here. Only use soundtrack if you really cannot identify the composer(s).
Again: Do not use this artist as a lazy solution unless it matches the previous description.