Two shows – one a blockbuster musical, the other a provocative premiere – make the upcoming weeks here one of the most significant stretches ever in Rochester theater. Two shows set in times nearly two centuries apart. But sharing one commonality. Hamilton: An American Musical has dominated the Broadway scene for a few years now. It’s America’s Founding Fathers, with a mighty twist: a rap and hip-hop musical, with people of color signing the Declaration of Independence. It opens Tuesday, April