Tuning is based on musical notation. Come on, the piano has a high pitch, and the music indicates the pitch. For example, the tuning of Lushan Mountain is D 1 6 minus 5 3 liters 2 1 D, and the original pitch is 1 6 5 3 2 1, so the pitch is increased to 1 according to the spectrum. L 1 6 5 3, immobile 2, semitone, l 2, and so on, just like this.