There are at least 5 artists/bands named Ouroboros: 1) A technical death-thrash metal band from Australia (who changed their name from 'DRED' in 2008)
2) A brutal death metal band from France
3) A dark-esoteric-ambient act from Italy
4) A black metal band from Canada
5) A doom metal band from Pittsburgh, PA
6) A visual kei band from Japan. See ＯＵＲＯＢＯＲＯＳ.

Read more about Ouroboros on Last.fm.