The audition disc is mainly used to test the sound quality and effect. All kinds of music effects are the main ones, and the quality of singing is secondary. Because it involves the copyright and cost of songs, all the original songs may not be selected, or the soundtrack effect of some original songs generally does not meet the sound measurement standard, so it is necessary to sing the soundtrack again. Therefore, some audition disc songs are covered.

Introduction of the test disc (audition disc):

Audition disc: Audio equipment manufacturers make their own brand of CD records, select various representative music for strict technical treatment, and produce and distribute them in limited quantities, so as to test the quality and effect of their audio products and win the praise of fans for their own brand audio with the best audio effect. These CDs are called audition discs.