The synthesizer is the closest instrument to the piano and was originally created as a replacement for the church instrument. Its advantage is that the student can easily obtain a harmonium as well as having the freedom to easily carry it wherever he wishes. Learning the harmonium is not far from the piano since both belong to the same family. The harmonium also allows us to use infinite sounds and rhythms, which explains why we often meet a person in a concert with a harmonium sounding like a whole band. During the lessons, special emphasis is given to the improvement of the technique with special emphasis on the posture and the movements of the fingers, wrists, hands, through a wide range of music from the fields of Greek folk as well as the foreign repertoire. If a student chooses harmonium lessons he can make amazing compositions and creations in combination with music technology lessons.