_____ became a popular subject in the 18th century

The term "extramusical" refers to __________

a) sounds beyond humanly audible pitch b) musicthat comes from a written score c) music that refers to ideas beyond the realm of sound d) ideas about musical virtuosity

If we agree that the recording “Postal Workers Canceling Stamps” sounds like music (the postal workers themselves, however, may not think the sound they are making is music), how does the chapter’s author, David Locke, intend to participate and be actively involved with the postal workers’ music?

What will be an ideal response?