Modification of the guzheng refers to raising or lowering the original key into another key. Specifically, the pitch positions of the 21 strings are rearranged.
The guzheng is tuned with a pentatonic scale, and the commonly used tuning methods are to achieve the purpose of "modifying" by "shifting the columns". Move the "3" (mi) note in the D-key pentatonic scale, that is, the fourth, ninth, fourteenth, and nineteenth strings through the Zheng code to move toward Qianyue Mountain, raise it by a semitone (fa), and serve as the main tone of G key " 1" (do), it becomes the pentatonic scale in the key of G. Using the same method, you can convert the key of G into the key of C. Please refer to the table below:
Chart 1: The phonetic position arrangement table of the 21-string guzheng in D key
Chart 2: The phonetic position arrangement table of the 21-string guzheng G key
Move the "3" sound (mi) in the G pentatonic scale, that is, the second, seventh, twelfth, and seventeenth strings through the zheng code in the direction of Qianyue Mountain, and raise it by a half step, as the key of C The tonic "1" (do) becomes the pentatonic scale in the key of C. Please refer to the table below:
Chart 3: Twenty-one string guzheng in C key position arrangement table