How long ago, about, did music begin to be written down?

The earliest written form of music is known to us from the Babylonian period which written in cuneiform tablet about 1400 B.C. Later on, we found music notation from Ancient Greece, which shows compositions and fragments of music. The modern written music which we know today is related to the 1200s Gregorian Chants in the church.        

the answer would be (b). the stave church in borgund, norway is an example of norse architecture.

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!