The light intensity distribution formed by light waves through gratings is actually the result of single slit (groove) diffraction and multi-slot (groove) interference of grating. It has been observed that after a step with enough stages reflects the incident noise of a certain intensity, the tone of a certain frequency band will be obtained in the reflected sound field. In this paper, the glare grating is regarded as a plane reflection sound grid, that is, the blazed sound grid, which gives the distribution of the sound intensity of the blazed sound grid, and also gives the constraint relationship that the corresponding path difference of the reflected sound waves between adjacent grooves is satisfied. At the same time, according to the field survey data and the corresponding spectral curve combined with the principle of plane reflection acoustic grating, the music phenomenon formed in the multistage step reflection sound field is analyzed, and the firecrackers under the monument of the Susan Anti-Japanese War Memorial in Maoshan, Jiangsu, China. The two phenomena of the “Put the firecrackers in the air under the monument” and “Recruiting crane” in Heshan, Qingdao, Shandong, China are explained as examples.