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In page Mildred J. Hill:

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It has been reported that Mildred Hill was a kindergarten and Sunday-school teacher, like her younger sister Patty.[citation needed] Prof. Robert Brauneis, after extensively researching the Hill family, has concluded that she was not a kindergarten teacher.[1] She moved into music, teaching, composing, performing, and specializing in the study of Negro spirituals. Hill and her sister were honored at the Chicago World's Fair (1893) for their work in the progressive education program at the experimental kindergarten, the Louisville Experimental Kindergarten School.