Question: Night Castle is the fifth rock opera by an American progressive rock band that was founded in 1993 by what producer?
Sentence (from "Trans-Siberian Orchestra"): The band has released a series of rock operas: "Christmas Eve and Other Stories", "The Christmas Attic", "Beethoven's Last Night", "The Lost Christmas Eve", their two-disc "Night Castle" and "Letters From the Labyrinth".
Relevant evidence: No