This study aimed to examine the characteristics of Ongakutekiyugi proposed by Minoru Wada (1876－1954). In short Ongakutekiyugi is children’s playing with music. Wada played an important role in early childhood educational circles from the late Meiji period to the Showa period. He built the unique theory on not only early childhood education but also children’s music (Ongakutekiyugi). The consummated theory of Ongakutekiyugi was composed of appreciation, singing and dancing. This theory was completed after several attempts. His four books (Yojikyoikuho, Yojihoikuho, Jikkenhoikugaku, Hoikugaku) and papers were the subject of study. His papers were accepted by the early childhood educational journal Fujin-to-Kodomo (later, Yoji-no-Kyoiku). As a result of consideration of these, there were differences between the second book Yoji-Hoikuho (1913) and the third book Jikken-Hoikugaku (1932a). In addition, his early paper differed from that of the Showa period. He added appreciation to the theory of Ongakutekiyugi in his third book, extended his research to the field of dance and had a positive response to dancing in his Showa period paper, unlike in previous writing. For 19 years from 1913 to, the importance of appreciation was discussed by a variety of scholars in the music education world and observation was included in the contents of childcare by imperial ordinance. His construction of the theory of Ongakutekiyugi was influenced by this movement.