What does it mean to sing to your wine?

While drinking wine, one should listen to songs. This involves exegesis, let's not talk about it. Let's see how the secondary school textbook explains it: "To drink wine and sing songs: drinking wine while singing songs. Dang, also means against." The words "right" and "when" are synonyms, and the textbook is right to interpret "when" as "against", but it is right to interpret "when singing" as "against". The textbook is right to interpret "when" as "against", but it is a big mistake to speak of "when singing" as "while singing". Imagine, when you are facing the wine, you can reach out and drink it, but when you are facing the song, can you hold it and sing it? The act of the singer, the advocate (song and dance artist), is not to be taken over. So, the meaning of these two lines is: "How many such happy hours can there be in life when you are drinking wine and listening to a song at the same time?" This listening and singing are not even close. The fact that the wine has to be drunk by himself and the song has to be sung by others is consistent with Cao Cao's position and status at that time.