The lyrics of Koryo Sogyo were delightful and also very popular. They were passed down through the generations among common people by mouth, and they eventually became modified and integrated into the music of the court. They are now preserved for future generations in "Akchang-Kasa" (Anthology of Musical Texts), "Akhak-kwoebom" (Canon of Musical Science), and "Shiyong-Hyangakbo" (Scores of Traditional Native Music), all compiled after the invention of the Korean alphabet during the Choson dynasty. Since these songs had their origins in folk song tradition, the style of sogyo is distinctly simple and straighforward, flowing with full and frank expression to the feelings of the people and beautiful rhythms. These songs were refined further in the process of oral transmission.

"Kasiri" (Would You Leave Me Now?).
"Would you leave me, leave me now? Would you forsake me now? Wi jungjulag the piping times of peace......" "Kasiri" is a song expressing regret at sending away a lover. Also known is "Kwihogok" (Song Praying for a Love's Return), this plaintive song, couched in simple and innocent expression, communicates the depth of emotion of one who has been left behind. It consists of four stanzas with the refrain "Wi jungjulag the piping times of peace" to every stanza, giving a sense of rhythm to the song. All of the lyrics are recorded in "Akchang-Kasa" (Anthology of Musical Texts) and the first stanza is included in "Shiyong-Hyangakbo" (Scores of Traditional Native Music).