This site lists an impressive - and massive - collection of avant-garde/Surrealist film & video, spoken word sound recordings, etc. (For example, 4 films and 42 sound recordings relating to Jean Cocteau).
Take the film section - material from everyone from Man Ray and Max Ernst to Jacques Derrida and Marshall McLuhan. Video of an interview with Philip K. Dick from the Sci-Fi Book Festival in Metz, France, 1977? William S. Burroughs Cut-up films? Erik Satie documentary? No problem!
The sound recordings section looks equally extensive.
Film & video archive: https://ubu.com/film/index.html
Sound recordings: https://www.ubu.com/sound/index.html
Main menu: https://www.ubu.com/