This poem means that the string belongs to the tube and the drum belongs to the gong.

"String to tube to drum to gong" is a traditional antithetical sentence, which means that the sounds of two musical instruments are relative. Among them, "string" refers to stringed instruments, such as pipa and guzheng; "Tube drum" is a percussion instrument, usually made of bamboo and shaped like a drum; On the other hand, gong is a percussion instrument made of metal, with a rich and loud voice.

This poem can also express a comparative concept, that is, the softness of stringed instruments and the excitement and loudness of tube drums, as well as the crispness of tube drums and the heaviness of gongs. This contrast can reflect different emotions and artistic conception. For example, the softness of stringed instruments can convey tenderness and tenderness, while the heaviness of gongs can express a solemn atmosphere.

In addition, this poem can also lead to a symmetrical concept, that is, comparing stringed instruments with tube drums and gongs, forming a formal balance and aesthetic feeling. This sense of symmetry is highly valued in China's traditional culture and widely used in architecture, painting, poetry and other fields.