Met preview

Tickets for the Metropolitan Opera's 2010-11 season are now on sale for members and subscribers; the general public can purchase single tickets starting on Sunday. The most tensely awaited items on the agenda are the first two installments of Robert Lepage's production of the Ring: Das Rheingold, which opens Sept. 27; and Die Walküre, which arrives on April 22. With less trepidation I am looking forward to the ridiculously belated Manhattan premiere of Nixon in China (Feb. 2) and to...