"Insane in the Brain" is a 1993 song by American hip hop group Cypress Hill, released as the first single from their second album, Black Sunday (1993). In addition to hitting number one on the US rap chart, the song also was a mainstream hit, reaching number 19 on the Billboard Hot 100 in 1993. It earned a gold certification from the Recording Industry Association of America and sold 600,000 copies domestically.[2][3]