What role do trills play in Mozart's compositions and how do they contribute to the overall musical expression and style of his works?

Trills in Mozart's compositions serve as ornamental embellishments that add flair and excitement to the music. They contribute to the overall musical expression by adding a sense of elegance, virtuosity, and emotional depth. Trills are often used to highlight important moments in the music, create tension, or add a sense of drama. Overall, trills enhance the beauty and sophistication of Mozart's works, showcasing his mastery of musical expression and style.