Primus is an American rock band formed in El Sobrante, California in 1984. The band is currently composed of bassist/vocalist Les Claypool, guitarist Larry "Ler" LaLonde, and drummer Tim "Herb" Alexander. Primus originally formed in 1984 with Claypool and guitarist Todd Huth, later joined by drummer Jay Lane, though the latter two had departed the band by the beginning of 1989, and were replaced by LaLonde and Alexander respectively.

El Sobrante is a census-designated place (CDP) in Contra Costa County, California, United States. The population was 12,669 at the 2010 census.