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
4) A doom metal band from Pittsburgh, PA
Revocation is a Technical Death Metal/Thrash Metal band from Boston, Massachusetts, formed in 2006 from Cryptic Warning. They combine the power and aggression of the old-school thrash metal style with the twisted musicianship of technical death metal. Their first release, "Summon the Spawn" demo, is a unique display of technical prowess and ferocious energy which came out in September of 2006. Their first full-length, "Empire of the Obscene" was released in May of 2008 and continued their face-melting style to positive reviews.