Blind Illusion is an American progressive thrash metal band from Richmond, California. Formed in 1978 by lead guitarist and main songwriter Mark Biedermann, the band has had several lineup changes, with Biedermann being the only constant member. Blind Illusion is also notable for featuring Les Claypool and Larry LaLonde, both later of Primus, who performed bass and guitar respectively on their 1988 debut album The Sane Asylum.

Leslie Edward Claypool is an American musician, best known as the founder, lead singer, bassist, and primary songwriter of the band Primus since its formation in 1984. Frequently considered to be one of the greatest bassists of all time, his playing style mixes tapping, flamenco-like strumming, whammy bar bends, and slapping.