In the first phase. There is only one voice and music is only one Melody is not called until the 19th century that harmonize the human we know 12 using a simple, sound coordination. A multiple music sounds.
In the first phase, and the music is the only one called Melody Concerto no. Century until the 12th man, we began to recognize the different sounds come together easily. Born into a musical polyphony up.
In the first stage, music has only one sound and the only known Melody no choir until century 12 humans began to know the use of various sounds coalesce easily. A music many sound up