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In page Charles Mingus:

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Mingus often worked with a mid-sized ensemble (around 8–10 members) of rotating musicians known as the Jazz Workshop. Mingus broke new ground, constantly demanding that his musicians be able to explore and develop their perceptions on the spot.[citation needed] Those who joined the Workshop (or Sweatshops as they were colorfully dubbed by the musicians) included Pepper Adams, Jaki Byard, Booker Ervin, John Handy, Jimmy Knepper, Charles McPherson, and Horace Parlan. Mingus shaped these musicians into a cohesive improvisational machine that in many ways anticipated free jazz. Some musicians dubbed the workshop a "university" for jazz.[citation needed]