There are two bands named Omnium Gatherum. Prominently we find the Finnish melodic death metal band on last.fm.
1) Omnium Gatherum is a six-piece melodic death metal band from Kotka, Finland. Founded in the autumn of 1996. Although the band mainly follows the path of melodic death metal genre, the music created by the band, especially the later albums, has strong influences from the progressive death metal sub-genre.