The six main elements of tragedy according to Aristotle are plot, character, thought, diction, melody and spectacle. Aristotle believed that thought, diction, melody and spectacle were the least important elements but that they must be done well in order for the play to be successful.
According to Aristotle, plot was the most important element of a tragic play. He believed that the plot was the action of the play. Although character gives an individual certain qualities, it is their actions that make them happy or miserable. Thought refers to what is said in the play, while diction refers to how it is said. Aristotle refers to the melody and spectacle of the play as "accessories." He says that the music must match the mood of the play, and the setting must match the theme.