Revealing the true nature of the work was itself apparently part of the publicity for the BBC broadcast of a radio documentary, The Strange Case of Piotr Zak, first aired on 13 August 1961, in which Keller discussed his hoax with music critics Jeremy Noble and Donald Mitchell. Both critics agreed that the manner of presentation required them to take the piece seriously, but, since they both had given it an unfavourable review, they could not be said to have been fully taken in by the hoax.
