Chris Willman Music WriterEd Sheeran is doing what could reasonably be considered a series of “underplay” shows this week, mostly for winners of radio contests, including appearances at New York’s Empire State Building and Irving Plaza. Before he headed east, the pop superstar got his very intimate mini-tour underway with a hour-long show for SiriusXM subscribers at the Belasco Theatre, the smallest and most club-like of the downtown L.A.