The sound base audition of China Conservatory of Music has a backup singer. The reasons why there are backup singers in the sound-based audition of China Conservatory of Music are as follows:

1. Evaluating the musical foundation: The sound-based audition is to evaluate the musical foundation and intonation ability of candidates. By means of accompaniment, the examinee's mastery of basic musical elements such as pitch, interval and rhythm can be better tested.

2. comprehensive ability investigation: the sound-based audition is not only a requirement for sound, but also an examination of the examinee's musical expression ability, emotional expression ability and overall understanding of musical works. Accompaniment can provide a better musical background and help candidates to better show their own

3. Simulate the actual singing situation: in music performance, it is necessary to cooperate with accompaniment or band in many cases. By adding accompaniment to the sound-based audition, the actual singing situation can be simulated, and the cooperation ability and stage expression of candidates and accompaniment can be investigated. Therefore, the sound base audition of China Conservatory of Music has a backup singer.