Alvin Lucier – I Am Sitting in a Room

HN cites it as the canonical work behind repeated re-recording experiments, and a pivotal piece of minimalist music worth listening to patiently.

Alvin Lucier's 1969 minimalist piece in which a spoken text is repeatedly played back and re-recorded in a room until the room's resonances replace the words. This is the 1981 Lovely Music recording.