The artist—whose subject matter was individuals in ordinary settings—who challenged, "Show me an angel and I'll paint one" was

A musical structure in which the same melody is repeated over and over again with different treatment and without intervening new materials is a

A. fantasia B. symphony C. theme and variations D. rondo

Which statement best describes this composition's performance style?

a) either by instruments or voices b) by voices alone c) even though the work includes text, such works were performed exclusively by instruments d) sections alternating vocal and then instrumental performance