How does the dan bau work?

The dan bau is a traditional Vietnamese musical instrument that consists of a long, narrow wooden body with a single string stretched across it. It is played by plucking the string with a finger while manipulating the pitch using a bamboo rod or a hand to create varying tones and expressive sounds. The instrument's unique sound is further enhanced by resonating the body and adjusting the tension of the string. The dan bau can produce a wide range of emotions, making it an essential part of Vietnamese music.