The erhu tuning starts from D, which can ensure that there are two open strings, d and a, when playing the five keys of B flat, F, C, G, D and A. In ancient China, the key of D was the main palace key. Among all the musical instruments, the erhu is the most singing and the musical instrument that is closest to the vocal range.

Erhu is a traditional Chinese stringed musical instrument with two strings, which began in the Tang Dynasty and has a history of more than a thousand years. Erhu includes the body, string system and bow. Luthiers usually make erhu from wood, such as mahogany, lobular rosewood, ebony, etc. One end of the piano barrel is covered with snake skin, which is the source of the unique sound of the erhu, and some advanced erhus use python skin.

When pulling the erhu, the bow should not be tilted upwards, as this will result in a bad tone. Holding the bow too tightly has resulted in thick calluses on the base of the index finger, the inside of the first joint of the thumb, and the outside of the first joint of the middle finger. Some people mistakenly believe that this is kung fu, but it is actually a mistake in holding the bow. When holding the bow, the middle finger stretches too far between the shaft and the bow hair, making it useless inside and out.

In the process of using the bow, do not touch the bow hair with your hands, so as to avoid oil stains on the bow hair after a long time, which will affect the performance. Once it is found that there is a lot of oil on the bow hair and it affects the performance, you can remove the bow, wash the bow hair in clean water with soap, dry it and apply rosin again before use. After playing the piano every time, the bow hair should be loosened to restore the bow shaft to its normal shape, otherwise the bow shaft will be deformed after a long time, which will affect the performance of the bow.