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Well it covers a lot of different techniques and has a lot of musical examples. Another book I used to have was by someone called Marion Bauer. It was quite old but was similar to Persicchetti. I cant remember the title. However, as with most 20th century techniques, there are nor real rules just some general principles and then whether your ear tells you you are getting what you want or not. Milhaud was big on polytonality. I remember hearing one of his symphonies called the Rhodanian which is about a river and he uses masses of independently keyed lines to suggest merging streams. The overall effect as I remember is fairly chaotic or dissonant. But if this is what you are trying to create then this might be a model. Obviously Charles Ives is another biggy especially when he uses recognisable tunes in different keys. It is all about what effect you are trying to create. Probably it is easier trying to locate musical pieces that do it rather than a theoretical explanation.
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Not so young
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