Since the application of the 7th Educational Curricula, people's understanding of Korean classical music has been improved, and textbooks also deal with it more importantly. However, actual Korean classical music classes at school often do not follow the rules of Korean classical music. In particular, music for appreciation in textbooks is presented using staff notation with basic theories only. In addition, the objectives of teaching are defined too fragmentarily and comprehensively to have specific activities, and students merely listen to music and present their feeling. Thus the present researcher found the necessity of research on teaching contents for Korean classical music appreciation classes. Sanjo is being taught as an essential subject at the department of Korean Classical Music in university. Sanjo is played commonly with Gayageum and other musical instruments such as Geomungo, Daegeum, Ajaeng and Haegeum. It is divided into various styles according to musical instrument. Sanjo is actively researched in the world of Korean classical music, but there are few researches applicable to education. Thus the present researcher studied teaching contents for appreciating Gayageum Sanjo, which represents Korean classical music. Learning and researching Sanjo, the researcher found that music score using staff notation causes confusion in studying Sanjo, and feeling the necessity of music score fit for teaching Sanjo more properly and efficiently, devised Sanjo Gueum Notation using the horizontal Jeonggan Notation through examining old Gayageum music and Gueum Notation. The researcher transcribed Park Sang-geun-styled Gayageum Sanjo into the devised horizontal Jeonggan Notation, expressing Gueum(sound), Changdan(rhythm pattern), line number and Sigimsae, and extracted key learning elements from movements (Jinyangjo, Jungmori, Jungjungmori, Gutgeori, Jajinmori, Hwimori) by dividing the music into Janggu-rhythm type, melody analysis and ending type in order to utilize in classes. This study extracted teaching contents that can be utilized in music classes as follows. First, this study defined nine objectives to achieve through appreciating Sanjo and explained the objectives step by step in detail. Second, this study presented nine steps structure-analytically in order for students to appreciate Sanjo fit for their level, and defined a total of eleven steps of learning with learning elements for each step considering relevant objectives of learning. Third, this study suggested contents to be taught in actual classes centering on learning elements according to the structure-analytical step. The contents are general flow, rhythm, tension and relaxation and melody and they are taught through the steps of introduction, understanding, development and deepening. Fourth, this study suggested a basic frame of teaching plan by dividing an effective teaching model into teaching methods related to listening, literature, structural analysis of concepts, transition and internalization in order to utilize teaching contents stated above in actual classes. Although this study was not exhaustive, it disclosed the unique beauty of Sanjo. The results are expected to be used in teaching the musical characteristics and attractions of Sanjo and be helpful in understanding traditional music.