Task: Question Answering
Input (English): Passage: Works of classical repertoire often exhibit complexity in their use of orchestration, counterpoint, harmony, musical development, rhythm, phrasing, texture, and form. Whereas most popular styles are usually written in song forms, classical music is noted for its development of highly sophisticated musical forms, like the concerto, symphony, sonata, and opera. Question: Works of classical repertoire exhibit what in their use of orchestration and harmony, and form?
Output (English): complexity