Which of the following ideas belongs to Confucius' musical thought?

The ideas that belong to Confucius' musical thought are "the beauty of neutralization", "music as a means of communication", and "the beauty of elegant sounds".

1. "The Beauty of Neutrality and Harmony": Confucius emphasized that music should have the qualities of peace, harmony and concord, and that the "beauty of neutrality and harmony" should be reflected in the performance of music.

2. "Music is a channel for the spirit": Confucius believed that music could influence the spiritual world of people, and could make people's minds calm and distant, with the effect of channeling the spirit.

3. "The Beauty of Elegant Sound": Confucius advocated that music should be part of the court culture and respected the beauty of elegant sound, believing that music should be in line with the tradition of etiquette and music, and that it should have the characteristics of elegance, beauty and civilization.