Answer:
b. false
Step-by-step explanation:
Wagner did not employ "idées fixes" in his operas. The term "idée fixe" is associated with the composer Hector Berlioz, who used it to describe a recurring musical theme that represents a fixed idea or obsession throughout his work "Symphonie fantastique." Wagner, on the other hand, is known for his concept of "leitmotifs" in his operas. Leitmotifs are recurring musical themes or motifs associated with specific characters, objects, emotions, or ideas. They serve as a powerful tool for conveying and developing the dramatic narrative in Wagner's operas, such as "Der Ring des Nibelungen" and "Tristan und Isolde."