Final answer:
In the exposition of the first movement of Mozart's Symphony No. 40, the theme is lyrical and in a minor key, providing contrast with the opening of the movement.
Step-by-step explanation:
In the exposition of the first movement of Mozart's Symphony No. 40, the theme is lyrical and in a minor key, providing contrast with the opening of the movement.
For example, in the opening of the movement, there is a sense of danger and fear conveyed through slow and mournful notes played in a minor key. However, in the exposition, a new theme is introduced that is lyrical and in a minor key, providing a contrast to the opening and creating a different emotional atmosphere.