According to Aiyang's inquiry. Com, the sound base of China Conservatory of Music is divided into three levels, namely, sound base level 1, sound base level 2 and sound base level 3. Starting from the summer vacation of 20 18, all majors of China Conservatory of Music have to take an additional test in phonology. China Conservatory of Music is the highest institution of national music art education in China, and it is a domestic social art grading institution with cross-provincial grading qualification approved by the Ministry of Culture.