"447 Exercises build the musical alphabet", an original solfege book for Greek data. It is based on the gradual construction of musical knowledge, with intervals being the basic structural element of melody. Initially, the minor third (3m) and the major second (2M) are introduced, and gradually, through simple exercises, the remaining intervals (perfect fourth, perfect fifth, major sixth, augmented fourth, major seventh, etc.) are worked on. Together with the gradual introduction of rhythm elements, the musical alphabet is built step by step. It is aimed at music teachers and students, creating a solid foundation at the beginning of their Music Studies. At the same time, this specific book is connected to the "35 duet pieces for children's choir based on Greek children's songs", where the practical application of the elements of the musical alphabet is encountered through the duet song.