Nocturnal Emissions is a British post-industrial sound art project that has released numerous records since the early 1980s. Their material has been described as blurring the lines between electroacoustic music, sound collage, noise, ambient, and musique concrete. The group's material constitutes part of an ongoing multimedia campaign in guerrilla semiotics, utilising video art, film, hypertext and other documents. The project was initiated in London in or around 1980 by Nigel Ayers (b.