Answer
**Opera is indeed not a genre composed by Massenet.** He primarily focused on operas, achieving great success with works like "Manon," "Werther," and "Thaïs." However, he also ventured into other genres such as oratorios, cantatas, and incidental music. His orchestral suites, including the famous "Scènes pittoresques" and "Scènes alsaciennes," showcase his mastery of instrumental composition.