What would a researcher who studies the tango dance music of argentina be called?

a: ethnomusicologist
b: historical musicologist
c: musical theorists
d: systematic musicologist

(i think it's c)

Correct answer is ethnomusicologist

Explanation:

I took the test

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.  

i think it's but if you get it wrong its not my fault : )