☆Sanjo is a term referring to the form of folk instrumental solo music, and each instrument has different types of rhythms, called "OOO ryu" and "OOO je" after the Person who made the melody.
In the 1960s, Han Il-seop (1929-1973) began playing the Ajaeng Sanjo. The ㄴstyle of Han Il-seop was passed down to Park Jong-seon, while the melody of Jeong Cheol-ho was played to Seo Yong-seok and Jang-Wol jung-seon to Kim Il-gu.
The style of Jang-wol Jung-seon consists of short Dasreum, Jinyangjo, Jungmori, Jungjungmori, and Jajinmori, and the chung is changed more frequently than that of Park Jong-seon.