(PITTSFIELD, Mass.) – The Karrin Allyson Trio, the Scott Robinson Quartet, and the U.S. Army Jazz Ambassadors big band headline the 12th annual Pittsfield CityJazz Festival, which runs October 7 through October 16 at various venues throughout the city. Allyson and the Jazz Ambassadors perform at the Colonial Theatre on Saturday, October 15; Robinson and…