At the same time, the rhythm and blues tradition developed into the early rock music known as rock and roll. Which musicians below where known for having rhythm and blues roots in the rock and roll style

This excerpt includes

a. an instrument playing a drone part b. hand claps by a performer c. a bowed string instrument d. a part for a bell?like instrument

The interval from one C note to the C note eight tones above or below is called an eighth, or a(n)

A. second. B. octave. C. third. D. fourth.