NYT – ““I’ve been reading up on the history of the place,” the composer and performer Ben Frost said. “It’s important to know your enemy.” Somehow he managed suppress even a hint of a grin. All right, then, take him at his word. As enemies go, this one is formidable. It is the New York Public Library on Fifth Avenue at 42nd Street, the 100-year-old fortress with the big marble lions that keep watch by the steps. He was standing next to Patience, the lion on the downtown side, as he talked about performing at the library on Sunday — not on the steps between the lions, but in the Rose Main Reading Room.