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James Tenney —
American
Composer
born on August 10, 1934,
James Tenney was an American composer and influential music theorist... (wikipedia)
All of these people kept on being professional musicians and composers in the strictest sense.
I've come up with another formulation about style: that it's essentially a manifestation of a certain habitual set of limitations. It's what a composer does NOT do that defines a style.