The sound of the four-hu is louder than that of the er-hu, and the tone is more prairie-style. It can also be distinguished from the appearance. The Sihu has two more strings than the erhu, so the fingering of the Sihu is not to press the strings with the fingertips like the erhu and other stringed instruments, but to use the second rhythm of the fingers. sound. The bow is divided into two strands, which are placed between the first string and the second string, and the third string and the fourth string.

In addition to these, Sihu is also divided into bass Sihu, mid-range Sihu, and high-pitched Sihu. The bass four-hu, also known as the big four-hu, is mostly used for accompaniment of rap music, and the small four-hu, that is, the high-pitched four-hu is mostly used for solo and folk instrumental ensembles. The alto sihu is the same as the high-pitched sihu, and it is mostly used for solo and ensemble with other folk instruments.

Erhu and Sihu are both traditional bowed and stringed instruments in my country, both originating from the ancient Xiqin, so there are many similarities between the two. It is made of snake skin, and the piano rod is also made of ebony or mahogany. We usually listen to Erhu more, while Sihu is mainly popular in Inner Mongolia, so we know relatively little.