Oklahoma Jubilee - A chorus of over 50 women from a 50-60 mile radius of Tulsa (Tahlequah, Bartlesville, Big Cabin, Jenks, Sand Springs, Cushing, Broken Arrow, Dewey, Sapulpa, Bixby, Collinsville, Owasso, and of course Tulsa).
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http://www.oklahomajubilee.org/