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Bob Ruggiero has written about music for nearly 30 years. Naturally, then, he’s read quite a few music books. He regularly reviews them for the Chronicle. Among the hundreds of titles that have passed before his eyes, Ruggiero never encountered one about War, the 1970s California band that created a fascinating mix of funk, rock, soul and Latin music and was wildly successful doing so, with a dozen Top 40 hits and one of the best-selling albums of 1973 in “The World Is a Ghetto.&rdqu