How to define the boundary between lyrics and poetry?

This seems to me to be a lyric. But you see, some parts are picked out to read alone, and it is another small poem.

In fact, lyrics are also called music literature, such as articles in the Book of Songs and Song Ci, which are all ancient lyrics at that time. In my opinion, lyrics and poetry must be separated, because in terms of content, poetry has more capacity, more feelings, language can be more detached, and images that only one person can understand can be used, but the lyrics are different. Because lyrics are also called music literature, which is both musical and literary. Its lyrics are attached to music, which plays a great role in the popularity of a song.

But now people are demanding more and more lyrics. For example, Jay Chou's blue-and-white porcelain, Qi Lixiang, Xiaogang's blue-and-white porcelain and so on. , are clearly poems, so there is no clear boundary. But the lyrics must not be too obscure, and it is best not to express too many feelings, so that the listener will be very tired. Generally speaking, a song has only one theme.