Birt Berglund has released music under many pseudonyms.
To name a few:
Birt Berglund, 253, Salt-Peter, Never Ataraxia, Ted Bringburl, Yukiko Jansson, FM-nätet, Grindtrubbel, Den lille elektriker, UFO Abductee, The (General) MIDI Lodge, Male Bondage, Problematic Pistil.
Some releases can be found below.