In reading music scores, there are a Fixed-Doh and a Movable-Doh. For music education in Korean schools, Movable-Doh has been mainly used because it provides greater feelings of melody and tonality. On the other hand for individual training in piano and organ, Fized-Doh has been mostly used because it provides a consistent auditory identity on the piano and organ. when the people trained in the use of Fixed-Doh play the piano and use of the Movable-Doh, they encounter confusion caused from the difference between Movable and Fixed-Doh. Therefore, the problems between the prespective of Fixed-Doh and Movable-Doh were investigated and possible solutions were discussed in this paper.