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.

Reid Laurence "Larry" LaLonde, also known as Ler LaLonde, is an American musician. He has been the guitarist for the rock band Primus since 1989, where he is known for his experimental accompaniment to the bass playing of bandmate Les Claypool. Previously, he played guitar for several groups including Possessed and Blind Illusion. He also has collaborated more recently with artists such as Serj Tankian and Tom Waits.