Water Walk (1960) & Variations V (1965) - John Cage
Read this really cool, excellent, nice, interesting interview from 1987 with Cage by John Held, Jr.

I put a nickel into the phone, and I called the number that Max had given us when he visited the Arts Club in Chicago. This time he didn't recognize my voice. And he said, "Are you thirsty?" And I said, "Yes." He said, "Well, come over Monday for cocktails." And so that was the end of the conversation. And I went back to Xenia, and she said, "Call him back!" (laughs) She said, "We have everything to gain and nothing to lose." So I called him back, and he said, "Oh, It's you." And this time he recognized my voice, and said "Come right over. Your room is ready." And it was then that we met anybody whom anyone would want to meet in the artworld.