The monochord has always been performed at Vietnamese traditional music programmes for foreign tourists and diplomatic corps as well as during the tours abroad of Vietnamese artists. The sound of the monochord resonates a profound feeling from the bottom of the heart, particularly among those living far from the motherland, thanks to its soft, charming, and emotional sound. The instrument has drawn much attention from many musicians, instrumentalists and musical researchers. According to Associate Prof., Dr. Nguyen Binh Dinh, Director of the Vietnamese Institute for Musicology, among single-stringed instruments in the world, the Vietnamese dan bau stands out from others as it is the only one that can produce overtones. Despite having no key in the string, the instrument can reach any musical pitch and demonstrate both vibrato and melisma techniques, making it perfect for conveying Vietnamese traditional melodies. By pushing the flexible wooden rod, the artist can adjust the stretch or slack of the string; thus the dan bau is the only stringed instrument in the world that can emit a basic chord with different pitches just by one pluck of the string. The configuration of the Dan bau has been experimented with by Vietnamese artists in order to update and diversify the instruments sound. Originally, it was made of just four parts: a bamboo tube, a wooden rod, a coconut shell half, and a silk string. The string was stretched over a sound box, tied on one end of the rod, which is perpendicularly attached to the bamboo….