Tony Award winner and Pulitzer Prize finalist David Henry Hwang always knew that his latest work, Soft Power, was going to be a play with a musical. Not to be confused with a play or a musical, or a play with music (in which songs simply accompany plot—different from a musical in which songs drive plot). Directed by Leigh Silverman, Soft Power, currently playing San Francisco’s Curran through July 8, is a genre-breaking new form of theatre.