Primus has opened at 18 U2 concerts.

Primus Website

Les Claypool (vocals/bass), Larry "Ler" LaLonde (guitar), Tim "Herb" Alexander (drums)

Primus formed in San Francisco in 1984. They released their first album in 1990 called "Frizzle Fry" and were soon signed by Interscope Records. Primus headlined Lollapalooza in 1993. They also recorded the original theme song for the animated show "South Park." Bands like Muse and Incubus count them as musical influences.