This biography tries to present Cage, warts and all. with a lot of good anecdotes, a year by year, sometimes month by month report, "he did this, he did that," with enough analysis so that people can grasp his ideas. For example, there are entire chapters on the meaning of Zen and the I Ching for Cage. Yet there are also comments from people about these shifting tastes. One of his friends said about his use of Zen: "He's an operator and it was the thing that was in the wind." (p. 138) There are aspects of his life left undiscussed. Revill refuses, on p. 84, to discuss a key element of Cage's life: the shift from the marriage to Xenia to his partnership with Merce Cunningham and how that affected him. Nonetheless I find many of the writer's quotation from others about Cage's character refreshing, like, on page 79: "Cage has been described as an inveterate name-dropper, and whether it implies a concern with self-validation or simply pleasure at a certain quality of company--a fine division in any case..." I also discovered how much of a self-promoter Cage was. The man knew how to market himself and get to know "important" people. After reading this book, you tend to see Cage, not as the man of chance, but as a man of deliberation, carefully even meticulously choosing the people he knows, how to get his work known, selecting what is different and unusual in his work, or selecting what is "in" to "important" people he respects, and so on. He often does look like an operator both in his social life and in his music.
Here is Cage: "I didn't study music with just anybody. I studied with Schoenberg. I didn't study Zen with just anybody; I studied with Suzuki. I've always gone, insofar as I could, to the president of the company." (p. 109-110)
Overall, I think this is an excellent first biography of Cage. Revill also is careful to show the sources of many of Cage's inventions and ideas. Very few, it seems, he invented. I would not agree with Schoenberg that he was an "inventor of genius." Personally I doubt Schoenberg had any interest in what Cage was doing. There are some scholars, by the way, who believe he never had private lessons with Schoenberg. As long as Schoenberg was alive, Hans Keller wrote, he never mentioned Cage studying privately with him. (p. 48) It is documented that he did attend his lectures at USC. Cage seems to be someone who took ideas and developed them when others discarded them. His "inventions" often came from the people he knew, such as Cowell, Harrison, Asian music, and so on. Revill shows how Cage loved complexity, but had little talent in traditional music complexity, such as we find in Boulez and Carter. So he found ways to make his own kind of complexity in method and abstraction, intentionally looking for the unusual.
Revill offers a good bibliography, a list of compositions by date, and a thorough index. He also quotes contemporaries like Henry Cowell and other composers regarding Cage. Also Revill did have access to Cage himself. Kudos to Cage for letting this warts and all portrait be published. The book was published in 1992, the year Cage died.
Others books on Cage I enjoyed: Paul Griffiths' little book, Cage, is very useful. I would also recommend Begin Again: A Biography of John Cage by Kenneth Silverman, and No Such Thing as Silence: John Cage's 4'33" by Kyle Gann.