The music test of Macau Polytechnic Institute is not easy. There are not many music majors in Australia, the choices are small and the competition is fierce. Vocal music refers to the form of music sung with the human voice. Vocal music is a pleasant, continuous and rhythmic sound that is mainly produced by the human vocal cords, working with the mouth, tongue, and nasal cavity to act on the breath. According to the difference in the range and timbre, it can be divided into soprano, mezzo-soprano, alto and tenor, baritone and bass. The range of each human voice is approximately two octaves.