There are several bands that go under the name Anhedonia.
1) Anhedonia, an IDM / Industrial project, which was found in the end of summertime in 2004. Its only member Vojtěch Smetana comes from Prague.
2) AnhedoniA, a one-man Black Metal project from Sweden.
3) Anhedonia, a Grunge / Industrial Metal band (formerly titled 'Skin Effect') from Canada. Read more on Last.fm