Bernard Heidsieck: Poem Partition V. Kurt Schwitters - Ursonate. Ursonate / Ursonography Excerpts (2005) Kurt Schwitters: Ursonate 1. Teil, I (arrangement for 4 speakers by Alexis Agrafiotis) UrSonate by Kurt Schwitters performed by Steven Schick and Shahrokh Yadegari. Ursonate. Kurt Schwitters.