Your answer would be: Fine details and rich tonal variations!
The growing middle class has lead to new markets, supported economic growth and has built stronger communities. Just like how rock and roll has brought people together, has helped develop new genres of music and has made tremendous strides in changing the music scene for the better.
<span>B is the correct answer. Artworks are grouped into periods or styles based on similarities that they share, for example a similar time of creation (for example, Medieval), a similar use of technique (for example, pointillism) or similar subject of depiction (for example, portraits). </span>
C. They where normally found in Gregorian Chant Music where the pope, priest, etc., would sing a line and the congregation would repeat it. That's what a plainchant or plainsong is. A cadence could also have neumes but that form of music did not come until later.