Pop divas in the 1980s and 1990s have helped erase ethnic background as an issue in romantic music

Which of the following is a physiological effect of plainchant?

a) increased anxiety b) lower blood pressure c) higher blood pressure d) lower levels of the hormone DHEA

The blues ________.

A. can be happy or sad, fast or slow B. usually follow a 12-bar pattern as a basis for improvisation C. may be vocal or instrumental D. All answers are correct.