For all you night owls out there, WNYC (93.9 FM) is presenting an Overnight Music Ring cycle, with tonight bringing the third of the four operas, Siegfried. (If you're not near a radio, you can listen in online now.) Host James David Jacobs informed us that the fourth and final opera, Gotterdammerung, would be broadcast on Wednesday night and on into Thanksgiving morning. As he put it, "The perfect music for stuffing a turkey, baking a pie crust, and settling in with your long lost relatives." Exactly.