What is the philosophical and aesthetic point of view that says jazz must develop and progress?

What was Louis Armstrong's role in King Oliver's Creole Jazz Band in Chicago?

a. lead trumpet, with prominent solos b. second cornet, with very few solos c. first cornet and band arranger d. vocalist

The present-day role in theatre of ________ , who assumes responsibility for interpreting the script and for approving and coordinating all of the elements that make up a production, is primarily a product of the late nineteenth century

Fill in the blank(s) with correct word