Check out an online archive of John Cage’s Indeterminacy stories here, and on YouTube below. Stereophile has this to say:
The idea behind Indeterminacy was, like many Cagean ideas, essentially simple and audaciously original. Cage read 90 stories, his speed determined by the story’s length. In another room, beyond earshot of Cage, David Tudor, pianist and veteran Cage collaborator, performed miscellaneous selections from Cage’s Concert for Piano and Orchestra and played pre-recorded tape from Cage’s Fontana Mix. The resulting collaboration is an astounding piece of “music,” and a fine introduction to the innovations of John Cage. “A wonderfully curious way to hear stories.”