I love this 3-hour conversation between Morton Feldman and John Cage recorded in 1967. An excerpt:
Morton Feldman: Well, this weekend I was on the beach.
John Cage: Yes.
MF: ... And on the beach these days are transistor radios.
MF: ... blaring out rock 'n' roll.
MF: All over.
JC: Yes. And you didn't enjoy it?
MF: Not particularly. I adjusted to it.
MF: By saying that... Well, I thought of the sun and the sea as a lesser evil.
JC: You know how I adjusted to that problem of the radio in the environment? Very much as the primitive people adjusted to the animals which frightened them, and which, probably as you say, were intrusions. They drew pictures of them on their caves. And so I simply made a piece using radios. Now, whenever I hear radios - even a single one, not just twelve at a time, as you must have heard on the beach, at least - I think, "Well, they're just playing my piece."