Here is a clip of John Cage's Work:
Here is a clip of Marcel Duchamp and John Cage:
I also found some images of how John Cage's music is notated:
Also mentioned in the chapter is Russolo's Ballet Mechanique, set to the Fernand Leger film.
This is a piece I've known and liked since undergrad music school, using metronomes and randomness:
And finally, the trautonium. First is a clip of Hindemith's Concertino Per Trautonium, 3rd movement. Second is a clip of someone playing the instrument alone.