Assertion: musical | /r/CapableOf | urge racial harmony
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Source sentences:
text: After Show Boat and Porgy and Bess, and as the struggle in America and elsewhere for minorities' civil rights progressed, Hammerstein, Harold Arlen, Yip Harburg and others were emboldened to write more musicals and operas that aimed to normalize societal toleration of minorities and urged racial harmony.