The number of music theory grades will vary with different grading systems. For example, in the grading organized by the Music Grading Committee of the National Musicians Association, the piano grading of the Central Conservatory of Music and the piano grading of the Shanghai Musicians Association, the music theory grading is divided into 1 grades. However, in another case, for example, in the imperial examination, the music theory examination is divided into 8 grades. Therefore, the specific number of music theory grading levels depends on the grading system adopted.