Single Bullet Theory is an American heavy metal band formed in 2000 by guitarist/vocalist Matt DiFabio. Known for their unique blend of melodic death metal and groove metal, the band's sound is characterized by complex guitar riffs, aggressive vocals, and intricate drum patterns. DiFabio, a former member of Pissing Razors, is notable for his dual role as the band's lead vocalist and lead guitarist. Among their influential works, "Route 666" and "Divine Ways of Chaos" have received significant attention within the metal community.