_____ are procedures that have been proven to work repeatedly. They are methods by

The hardened leather amulets worn by the Islamic African ruler Nana Diko Pim III (fig. 4.7) contained __________

Fill in the blank(s) with correct word

The Beatles' influence on American rock music may be seen through later performers' use of ________.

A. new electronic effects B. "classical" and nonwestern instruments C. unconventional scales, chord progressions, and rhythms D. All answers are correct.