Great anecdote on the official website:
In 1941 Cage got a commission for CBS Radio to write music for a radio play. Initially Cage composed work, based on his ideas using electronic sound effects, assuming this could be realized in the CBS studios. A week before the radio broadcast, Cage went over to make the recordings, but since the technician told him it could not be done in such a short time, Cage had to compose another work, just four days before its broadcast. The original manuscript is probably lost.