Richard Wagner was a German composer, conductor, and theatre director who is widely considered to be one of the most influential figures in the history of OPERA. His works include the four-letter opus, 'Der Ring des Nibelungen' (The Ring of the Nibelung), the five-letter OPERA, 'Lohengrin', and the nine-letter 'Ring Cycle'. Wagner's works are renowned for their complex musical structures and their use of leitmotifs, which are musical themes associated with characters, places, and ideas.