The cornual feather on the palace is a traditional pentatonic scale in China, which corresponds to five tones respectively. Each tone has its own typical instrument:

1. Palace: An ancient percussion instrument, represented by drums, has a loud voice and is suitable for expressing the rhythm and skeleton of music.

2. Quotient: Metal musical instruments, such as gongs, bells and cymbals, have high voices and are suitable for expressing the climax and emotion of music.

3. Horn: Bamboo and wood musical instruments, such as flute, flute, birdsong, etc. The sound is crisp and suitable for expressing the melody and color of music.

4. Logo: stringed instruments, such as erhu and Ma Touqin, have melodious sounds and are suitable for expressing the emotion and charm of music.

5. Feather: plucked musical instruments, such as guqin and guzheng, have soft sounds and are suitable for expressing the softness of music.

It should be noted that these five notes are not absolute, and different instruments may have some subtle differences in playing. At the same time, there are many musical works with different tones in modern music, among which the interaction between various musical instruments is more complicated.