This study aimed to analyze musical pieces and seek ways to utilize it for gasa education. The research method mainly focused on literature analysis. First, previous studies and textbooks validated that gasa education was not properly done. Thus, the implication that educational contents should be constructed responding to each school level through a close analysis of musical pieces was derived. In addition, the analysis direction and detailed elements were extracted by placing a category of lyrics, jangdan, and melodies for full-scale analysis. Based on this, each musical piece was analyzed. The result of the analysis indicated that since gasa has very diverse characteristics for each musical piece, activities that reveal each piece’s characteristics along with the genre’s traits must be performed. Finally, based on the analysis, a school level appropriate for musical pieces was selected, and areas and activities, forms of music scores, and the direction of linking with other school subjects were detailed, considering the levels of music. This study did not deal with practical teaching and learning methods because it focused on the analysis of gasa’s musical pieces and an outline of educational uses. Practical teaching and learning methods will be covered in the next research project. It is expected that the findings of the study will be used in actual gasa education.