Art rock es un término usado para describir a un amplio subgénero de la música rock que se caracteriza por su tendencia experimental y sus ambiciones intelectuales, con las que muchos artistas buscan darle credibilidad al rock.
Experimental music is a general label for any music that pushes existing boundaries and genre definitions. Experimental compositional practice is defined broadly by exploratory sensibilities radically opposed to, and questioning of, institutionalized compositional, performing, and aesthetic conventions in music.
Rock in Opposition or RIO was a movement representing a collective of progressive bands in the late 1970s united in their opposition to the music industry that refused to recognise their music. It was initiated by English avant-rock group Henry Cow in March 1978 when they invited four mainland European groups to come to London and perform in a festival called "Rock in Opposition".