Psyopus (sometimes written as PsyOpus) is a mathcore band from Rochester, New York. Formed in 2002, the band is noted for the unorthodox and extremely technical guitar techniques of Christopher Arp, often referred to as "Arpmandude". In order to receive endorsement deals from various guitar and amp companies, Arp had to send a live video of himself playing in order to prove that he could actually play as fast as he does.