it makes it more dramatic
Explanation:
Shadow (B) is a realistic characteristic of a drawing.
The key signature allows the composer to use less accidentals which makes the music less cluttered. Just like the other person who answered this said when a score with multiple instruments is written it is almost always all in the same key to keep the music organized (their answer is better)
The Byzantine Empire was the eastern part of the Greek Empire. The Greeks believed in many gods, and often depicted them on pots and even Effigy containers. The Greeks did not have very many colors available to them, so often times these vases or Effigy containers were painted in black and red.