There are several bands with name "Black Autumn": 1) Depressive black metal band from Germany - one-man project of M. Krall. Biography: Black Autumn is a German Black-Doom Metal act from the foggy banks of Hemer, located at the border to the Sauerland.
Founded around 1995 to celebrate Black Metal in the vein of Emperor, Satyricon and Ulver the project started out as a two-member-band. Due to lack of proper equipment first recordings were delayed until 1998 when Michael Krall and TH showed off with their first recordings.

Read more about Black Autumn on Last.fm.