Being a musician, Jean Reis has a natural affinity for playing instruments, as well as having an ear for music. Needing to defend herself, especially after joining The Valkyrie Pirates, Reis took to using her musical skills as a form of self defense. What resulted was a fighting style her crewmates like to refer to as her "Concert" (音楽会 Ongakkai,) albeit Reis tends to call it Showtime (ショータイム Shōtaimu) instead. "Showtime" typically involves Reis' use of musical equipment for battle, ranging from harmonicas to microphones and headphones. She has also physically trained herself to control the sound she naturally produces with her body, such as through walking or snapping her fingers. And finally, with the use of her instruments and body alike, Reis has shown the ability to attack and defend