Gotham Chamber Opera's production Baden-Baden 1927—re-creating the legendary quadruple bill of Milhaud's L'Enlèvement d'Europe, Hindemith's Hin und zurück, Toch's Die Prinzessin auf der Erbse, and Weill's Mahagonny Songspiel—opens next week. Paul Curran directs, with stage designs by Georg Baselitz; Helen Donath, in a rare New York appearance, takes the Lotte Lenya role in Mahagonny.