Madonna was spotted texting during Act Two—the light shining up from her phone was the giveaway. A rap and hip-hop history musical about a Republican hero can’t be good—but it is, and it isn’t a snide caricature of American history. Hamilton is the hot ticket of the moment in New York. Amongst the privileged old mostly white folks who have already seen it are Julian Lloyd Webber, Paul McCartney, all the Clintons, and Mrs Obama. Andrew Hamilton, the founding father on the US ten-dollar note, shot dead by Aaron Burr, “embodies hip-hop”, says Lin-Manuel Miranda—he should know, he wrote the…