Zhonghu
From Wiki China org cn
If we call the erhu Chinese violin, the zhonghu (mid-pitched erhu) is then the Chinese viola, where zhong stands for "middle." It was developed on the basis of the erhu in the 1940s. Both the structure and performing skill of these two are quite the same, yet zhonghu has a deeper-sounding timbre but not as agile. Being more suitable for singing melodies (particularly some Mongolian melodies), zhonghu is thus often used as tutti or accompanying instruments, sometimes for solo too.
