Transcription: Although opera includes dialogue and action, it's best known for the conveyance of drama by and through music. The thoughts of kings, factory workers, politicians, and lovers alike are revealed in song. Operatic themes are usually based on literature, history, or mythology, and run the gamut of human passion. Verdi's Otello, for example, highlights the dark side of human nature in its displays of jealousy and manipulation. Mozart's Cosi Fantutti is a comic opera of love and infidelity, while Wagner's Parsifal is the solemn retelling of the Grail story.