Why is it important that the steady beat stays the same within a piece of music?

Answer the following question in 3-4 complete sentences. define the following terms: medium technique proportion

Which is a good guideline to follow when evaluating art

Artists best achieve contrast in a composition by: a. drawing with realism b. shading a drawing with dark and light values c. using drawing techniques like stippling and hatching d. focusing on line and shape in a drawing