"Rock in Opposition" (RIO) is a musical movement that emerged in the late 1970s, characterized by its rejection of mainstream rock music conventions. It aimed to promote avant-garde and experimental rock bands that often faced commercial challenges. The movement was initiated by a group of artists who sought to create a platform for innovative music that defied traditional structures and expectations. The first official RIO concert took place in 1978 in London, featuring bands like Henry Cow, Stormy Six, and Slapp Happy. These groups shared a commitment to artistic integrity and political engagement, often incorporating elements of jazz, classical, and world music into their compositions. RIO has since influenced various genres and continues to inspire musicians seeking to push creative boundaries.