21st. Century Christ Ministry
From the back cover: Traveling with her husband, W.V. Grant, Jr., she is called in newspapers around the country "America's leading female gospel organist." In the South, people of all races call her "Miss White Soul."
Grant originally operated from a ministry located in Over-The-Rhine, an economically depressed area in Cincinnati, Ohio in the 70s.
Grant's wiki page doesn't mention Shirley.