The Mars Volta is an American progressive rock band formed in 2001. The band's only constant members are Omar Rodríguez-López and Cedric Bixler-Zavala, whose partnership forms the core of the band. The band's current line-up also includes founding member Eva Gardner (bass), Omar's brother Marcel Rodríguez-López, Leo Genovese and Linda-Philomène Tsoungui (drums).