Big Sir is a band that includes which bass guitarist, a Mexican-American musician, best known as the longtime bassist of Racer X and The Mars Volta?
Big Sir (band) Big Sir is a band that includes the bass guitarist Juan Alderete (The Mars Volta and Racer X) and the singer Lisa Papineau.
Jon Walker Jonathan Jacob "Jon" Walker (born September 17, 1985) is an American musician. Formerly the bassist of Panic! at the Disco, Walker was also the lead guitarist and occasional split vocalist of The Young Veins (which he founded with former Panic! lead guitarist Ryan Ross), now on indefinite hiatus. Having went on to release several solo recordings, he is now mostly songwriting and producing.