1. Music: Opera is a form of musical theatre that combines vocal and instrumental music. The music is typically composed by a single composer.
2. Libretto: The libretto is the text of an opera. It is traditionally written in verse and sung by the performers.
3. Scenery: The scenery of an opera is the backdrop and props used to create the setting of the performance.
4. Costumes: The costumes worn by the performers help to create the characters and the time and place of the opera.
5. Direction: The director of an opera is responsible for overseeing all aspects of the production, including the music, libretto, scenery, costumes, and lighting.
6. Performance: An opera is a live performance given by singers, dancers, and musicians.