What are the characteristics of minor modes in the upper reaches of the Yellow River?

In minor, there are two pentatonic modes, namely, number and quotient, pentatonic feather mode, six-tone and seven-tone mode. Melody with feathering as the main melody and minor works ending with a sign are also more common. In the minor melody of northern Shaanxi, jumping up or down by four degrees from the mode tonic is a typical feature, and jumping by seven degrees and eight degrees is also very common, which is quite close to the folk song style; The seven-tone scale "567 1234" is commonly used in Guanzhong minor, and its mode structure is the same as that of the bitter tune in Shaanxi opera, with strong local characteristics; The minor melody in southern Shaanxi has small fluctuation, multi-purpose progressive, stable rhythm, narrow range and more detailed and beautiful style.