What other musical technique went hand in hand with clear contrasts between major and minor keys, as well as with abrupt changes in orchestration?

A central musical idea which may be restated and varies throughout a musical work is called a(n) _____

a. disjunct b. movement c. allegro d. theme

At their height in the late fifteenth century, the ________ ruled a Peruvian empire of some sixteen million people. They left monumental architecture, textiles, and ritual objects in silver and gold

A. Aztec B. Inca C. Maya D. Tua