One Theory is a melodic hardcore band from San Diego, CA with influences ranging from old school metal, to punk, to new age metal. One Theory has shared the stage with bands such as God Forbid, Drowning Pool, The Exies, Hed P.E., Mower and more!

For fans of In Flames, Killswitch Engage, 36 Crazyfists, Staind, Slayer and more!