In Alium (1968)

It is impossible to categorise Tavener as he ceaselessly explores meaningful and penetrating sounds. For instance, his work In Alium was inspired by what he calls “A somewhat surrealist memory of childhood with Sunday School hymns and childhood prayers”. It features a very high solo soprano singing (in French) with her pre-recorded self in a canon of up to 24 parts, as well as pre-recorded children’s voices. [...] Add in sound effects from loud organ, gong and tubular bells and it really does become a surreal cacophony.