Leung: sound emanating from a hole. It refers to the sound of wind, water and birds in nature: Heavenly Melody, Drum Corner Lingering Heavenly Melody, Guanshan Mountain Leaning on the Moon Wheel.
Heavenly music is the sound coming from the sky, which should only be heard in the sky, and is rare on earth.
Heavenly music refers to the sounds of nature, such as wind, birdsong, springs, and all kinds of sounds that unite heaven and earth, the essence of the sun and the moon: the later generations called the poetry that is not decorated with carvings and has the interest of nature heavenly music. Now, it is used as a description of the sound in common usage.