SOLD OUT! The signs taped to the front doors of Jordan Hall told a rare story for Boston’s classical music scene. Odyssey Opera began its second season with a hit on its hands—the Boston premiere of Erich Wolfgang Korngold’s 1920 opera Die tote Stadt (The Dead City), a romantic work now best known for a soaring soprano aria, “Marietta’s Lied,” a favorite of any diva who can sing a high C on pitch (and some who can’t).