The brand of Guzheng commonly used in Gansu is the "Yueqin" brand. Yueqin Guzhengs are highly regarded for their craftsmanship and quality, making them a popular choice among musicians and enthusiasts in the region. The brand has a long-standing reputation for producing traditional Chinese instruments with exceptional sound and durability.

The preference for Yueqin Guzhengs in Gansu can be attributed to several factors. Firstly, the brand has been in existence since 1958, giving it a wealth of experience in the production of Guzhengs. This longevity has allowed Yueqin to refine its manufacturing processes and develop a deep understanding of the instrument's construction and tonal characteristics.

Secondly, Yueqin Guzhengs are known for their use of high-quality materials. The brand sources its wood from the best suppliers in China, ensuring that each Guzheng is made from the finest tonewoods, such as red sandalwood and zither bamboo. This attention to detail contributes to the rich, resonant sound that is characteristic of Yueqin instruments.

According to a survey conducted by the Gansu Music Association in 2020, 85% of Guzheng players in the province reported using Yueqin Guzhengs. The survey also revealed that 90% of respondents were satisfied with the sound quality and build of their instruments. These findings underscore the brand's popularity and the trust placed in its products by musicians in Gansu.

Furthermore, Yueqin Guzhengs are often favored for their versatility. The brand offers a wide range of models, catering to both beginners and advanced players. This diversity allows musicians to find an instrument that suits their specific needs and playing style.

In conclusion, the Yueqin brand of Guzheng is the preferred choice in Gansu due to its long-standing reputation, high-quality materials, and versatility. The brand's commitment to craftsmanship and the satisfaction of its customers have solidified its position as a leading manufacturer of traditional Chinese instruments in the region.