Every July 4th, the TV channels roll out “Yankee Doodle Dandy,†the story of Broadway’s Cohan family that won Jimmy Cagney an Oscar. “Mr. President,†Cagney intones, “My mother thanks you. My father thanks you. My sister thanks you. And I thank you.†The Cohans would appreciate that something of a stage sequel rose in their wake and that, still, …
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