I finally got a copy of Emmett Williams's Anthology of Concrete Poetry, thanks to Primary Information, who has reprinted the seminal book for the first time since 1967. I've been spending some time looking through it this afternoon was especially drawn to these circular poems by Ferdinand Kriwet, which blend typography, poetry, and sound into an interesting visual:
He describes these as "Hörtexts, Radio Texts" - radio pieces composed of noise and sound bite and samples. Kriwet's works are an attempt at communicating an idea of listening to something that constantly surrounds us on short, medium and long wave frequencies. His politically engaged and avant-garde approach was influenced by aesthetic and Conceptual currents in Constructivism, New Music, Beat Generation and Pop.