Confucius was talking about music with the music master of Lu. He said: “We can know this much about music: It begins with everyone trying to play together; when it gets in full swing it flows harmoniously, clearly, and continuously until it reaches the end.”
Confucius regarded music as being at the very apex of human civilization.
Unfortunately, the meaning of his first comment on the subject in the Analects is ambiguous to say the least. My translation is at best an educated guess.