Who wants to do Z o o m for educational things

Why were staff lines an important improvement to musical notation a. sl indicated rhythm b. sl indicated dynamics c. sl indicated pitch d. sl indicated meter

What is the term for a re-current musical section between various contrasting sections

The major axis of earths orbit is 299,200,000 km, and the distance between the foci is 4,999,632km calculate the eccentricity of earths orbit. how does this value compare to the value noted in. the digging dipper?