Co-authored by Kim Ki-soo and Gu Un-guk, this score has been owned by every geomungo player since its publication in 1984. Although various fixed geomungo scores have been published recently, the melodies contained in this score serve as the standard for actual performance, particularly for accompanying gagok. The textbook is structured to aid understanding in performance by detailing the performance techniques necessary for reading the score, including practice pieces for beginners, and