<span>The answer is post and lintel. This is used on on windows, weight bearing supports trusses, over doors. This kind of construction is used to carry large heavy weight bearing loads of downward force. This is common in home basements where there are long beams and supporting posts beneath.</span>
Pretty sure it is B. 600 A.D
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)
