I want to know the answer to the following question:
What popular styles practice improvisation and ad libitum ornamentation?
All the background I'm provided with is that "Another difference is that whereas most popular styles lend themselves to the song form, classical music has been noted for its development of highly sophisticated forms of instrumental music such as the concerto, symphony, sonata, and mixed vocal and instrumental styles such as opera which, since they are written down, can attain a high level of complexity.". Is that enough to answer the question?
Answer: no