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. Arp considers Psyopus to be a very technically proficient band: "I understand people not understanding us so by default the music comes across as noise but, the music makes sense to us all too much and every 16th note was scrutinized." Regarding learning to play guitar, Arp says: "I learned to play guitar in my bedroom. I got my first guitar in eighth grade. I bought Metallica tablature books, Megadeth books, guitar magazines, didn’t do homework and just played guitar all night."

The band released their 2nd album Our Puzzling Encounters Considered in February 2007. The techniques Arp uses have made it even more difficult to receive any endorsement. Arp himself said, "Mesa Boogie has not done very much to sponsor me because I do too much of this," as he raised his guitar by the whammy bar shaking it up and down. The band released their third studio album Odd Senses, on February 17, 2009.