The main role of art education in a knowledge-based society is to develop creativity. In our school, art teachers—myself among them—have studied this theme for three years. In the first year, I held a music class, whose theme was “composing music by computer—based on learning about music style, and wrote a paper about my research in this bulletin in 2013. In the second and the third years, I held a music class whose theme was “composing background music to fit the image of poems”. This paper is about the third year’s lesson improving on the second year’s lesson. The point of improvement is the adoption of active learning across all the lessons. In our school, we have a notion that the educational route to creativity contains the following three steps; (1) the acquisition of knowledge and skill, (2) thinking and judgment abilities, (3) expressive power and the expression of creativity. In the case of my lesson plan, the former half is based on (1) and (2), the latter half is based on (2) and (3). On the basis of students’ learning processes, their works, and an analysis of the students’ worksheets, I construct a model of creativity.