some universities abroad now provide education in this animal dance. Top dancers are recognised as "Living National Treasures" and are charged to pass their dances down to their students. Such official holders of traditional dances include Kim Sook-ja, a practitioner of salpuri originating in the shamanic rituals of Gyeonggi province. The lineages of dance and dancers may be traced back several generations through such connections. The 1970s saw a systematic effort to document Korean dances in North Korea by U Chang-sop. He developed a system of dance notation called the Chamo System of Dance Notation. Types Korean traditional dance shares some similarity with form of dance known as contemporary and lyrical. Moves follow a curvilinear path with little short term repetition. The dancer's legs and feet are often entirely concealed by billowing Hanbok. Emotional attributes of the dances include both somberness and joy. The dancer must embody the fluid motion that surges through the traditional music that the dancers perform to. Korean traditional dance is often performed to Korean traditional music, which includes traditional drums, flutes, and more. The music is what upholds the dance and the dancer is the tool that shows the music in physical form. Court dance Korean court dances is called "jee" (hangul:정재, hanja:呈才) which originally referred to "display of all talent" including not only dance but also other performing arts such as jultagi (줄타기 tightrope walking), gong deonjigi (공던지기), and mokmatagi (목마타기) but gradually only denoted "court dance". The term has been used since the early period of Joseon dynasty. Jeongjae were used to perform for the royal family, court officials, and foreign envoys or for festive occasions sponsored by the state. Jeongjae is divided into the two categories, "Hyangak jeongjae" (향악정재) and "Dangak jeongjae" (당악정재). Hyangak consists of the indigenous court dances originated in Korea, whereas Dangak are the dances derived from court dances of Tang China during the Goryeo dynasty. Hyangak jeongjae Ahbakmu (아박무), Ivory clappers dance Bakjeopmu (박접무), fluttering butterfly wings dance Bonglaeui (봉래의), phoenix dance Cheoyongmu (처용무), dance of Cheoyong, Dragon King's son which is the oldest jeongjae originated in the Silla period Chunaengjeon (춘앵전) dance of the spring nightingaler Gainjeonmokdan (가인전목단), dance depicting beautiful women picking peonies Geommu (검무), sword dance Jinju geomu Hakyeon hwadaemu (학연화대무), Crane and lotus pedestal dance Goguryeomu (고구려무), Goguryeo dance Muaemu (무애무) Musanhyang (무산향), fragrance of dancing mountain dance Mugo (무고), drum dance Gyobang mugo