Okay I think I can help u here
the authors purpose is to draw the reader in to read this and sya wow I wonder that the future will look maybe it will look like all shiney or just something of that nature
The compositional innovations are referred to styles or forms of music during last centuries and today they are studied by great musicians.
The order from earliest to latest is the next:
1. The Guidonian Hand. It comes from around 416 to XV century.
2. Polyphony. Its origin is from IX approximately.
3. Organum. The historian put it around XI and XII.
4. Motet. At century XII.
Answer:A
Explanation:i just did it