Om is an American stoner rock band from San Francisco, California. Formed as a duo in 2003 by the rhythm section of the band Sleep, Om is currently a trio consisting of Cisneros, Emil Amos (drums), and Tyler Trotter (guitar).

Sleep is an American stoner/doom metal band from San Jose, California. Guitarist Matt Pike and bassist and vocalist Al Cisneros have been the only constant members throughout the band's history. Critic Eduardo Rivadavia describes them as "perhaps the ultimate stoner rock band" and notes they exerted a strong influence on metal in the 1990s.