FEVER 333 is an American post-hardcore band formed in Inglewood, California in 2017. The three-piece band consists of ex-Letlive vocalist Jason Aalon Butler, ex-The Chariot guitarist Stephen Harrison and Night Verses drummer Aric Improta. "333" represents the band's three principles: community, charity and change. Their musical style merges elements of hardcore punk and hip-hop, which the band describes as being "rooted in subversion", citing musical influences such as Rage Against the Machine, Public Enemy, and Black Flag.