The melodies in the period of classical music are mostly rigorous, elegant and dignified, while The Romantic Period's music is relatively more subjective. Intensity, freedom and boldness are the main styles of this period. The most distinctive features of national music school are mode, melody and harmony. In terms of modes, many works are mainly based on major and minor tones, and at the same time, various modes and scales unique to national folk music are inserted, such as various folk natural modes, minor modes with four or seven tones, pentatonic scales, alternating major and minor tones, and a few full-scale scales. In melody, they not only have their own different national styles and personality characteristics; At the same time, they also have common characteristics. For example, melody lines are mostly carried out in natural sounds, which is different from the common inflection in late romantic music and gives people a simple and cordial feeling. Its rhythm is complex and changeable, asymmetric and irregular; In harmony, Musorgskiy and Grieg's expression techniques are particularly bold, novel and colorful. In their works, due to the needs of different forms of expression, they creatively use chords with special structure, complex chords and unexpected connections of various chords, sometimes highlighting the traditional or folk mode function harmony, and sometimes deliberately obscuring its function, resulting in unclear or hazy mode and harmony, which shows the harmony language of Impressionism to some extent.