Dial-A-Poem (1968) - John Giorno
"After having a conversation on the phone with Burroughs in 1968, Giorno initiated the Dial-A-Poem Poets concept, which he claimed would later influence the creation of information services creation over the telephone, such as sports and stock market. Fifteen phone lines were connected with individual answering machines: people would call Giorno Poetry Systems and listen to a poem they were offered from fragments of various live recordings. Dial-A-Poem, from 1969 on, was very successful, with 9 a.m. to 5 p.m. and 8.30 p.m. to 11.30 p.m. peaks. GPS used a variety of social issues at the time, what with the sexual revolution and the Vietnam War, which would create appeal as well as shock from the reactive community.
-- FROM THE GIORNO POETRY SYSTEMS WIKIPEDIA
Just by looking at the leaflet Andy Warhol came to mind and after reading the wikipedia article I see he did indeed influence Giorno a lot.