The New York City Opera is to present Kurt Weill and Bertolt Brecht’s double bill, “The Seven Deadly Sins” & “Mahagonny Songspiel.” The production will mark the first collaboration between the Teatro alla Scala and New York City Opera; audiences will see Irina Brook’s production, which was first performed in Milan. “The Seven Deadly Sins” & “Mahagonny Songspiel” will be {…}