Airs Saturday, April 13 at 11 a.m. The 2012-13 Metropolitan Opera Radio Broadcast season continues with a live broadcast of Die Walküre, the second of the four operas in Wagner’s epic Der Ring des Nibelungen. Met Principal Conductor Fabio Luisi leads the performance, part of the first of three Ring cycles that will be heard at the Met this season in honor of the composer’s bicentennial. Deborah Voigt returns in the title role of the warrior maiden Brünnhilde, in a cast that also includes Mark Delavan in his company role debut as her father Wotan, ruler of the gods; Stephanie Blythe as his formidable wife Fricka, the goddess of marriage; Martina Serafin in her Met debut as Sieglinde and Simon O’Neill as her twin, Siegmund; and Hans-Peter König as Sieglinde’s brutal husband, Hunding. Die Walküre will be heard live over the Toll Brothers-Metropolitan Opera International Radio Network at 11 a.m. CT on Saturday, April 13.