The finishing touch is often used to describe the highlights of an already excellent work that make the whole work more brilliant, or even "live". Such highlights are also called the finishing touch. If you ask what is the finishing touch of erhu playing art, I will answer without hesitation: portamento.

Of course vibrato is also very important, but it is the commonality of stringed instruments. Glide is also used in stringed instruments, but the erhu is the most widely used, and has many changes and profound knowledge. Think about it, is there any real erhu song that doesn't use portamento? It can be said that without portamento, there is no erhu; with erhu without portamento, there is no erhu flavor.

Erhu's commonly used portamento includes upward portamento, glissando, pad finger portamento and back portamento. There are two kinds of backslides, upwards and downwards. The slides that start from the primary note to the higher notes and then slide back to the primary note are called backslides. They are represented by upward curved arcs and arrows, and are written in the notes. The portamento that slides from the primary note to the lower note and then back to the primary note is called the next portamento, which is represented by a downward curved arc plus an arrow. In the music, the following backslides are mostly used to decorate the sound head. There is another kind of Glide, which is rarely used, so I won't introduce it in detail.

Please pay special attention that learning erhu glide should be carried out on the basis of having a good concept of intonation, being familiar with various positions, and being proficient in changing bars. Compared with other stringed instruments, especially the violin, the various glissando of the erhu has its own unique strong national flavor.