In 1943, Ishiketa’s “Small Symphony” was awarded at a music competition. Starting in 1946, he regularly joined the composer group “Shinseikai” and composed several pieces. In his early days, he published many pieces of academic chamber music that had German classical style, but then released pioneering new styles of music for Japanese instruments such as “Three Chapters’ Concerto for Koto” (1951) and “Suite for Koto” (1952). He also wrote some pieces using the avant-garde technique of twelve-tone music, such as the song “Karasu (Crow)” (1956), the opera “Sotobakomachi” (1957) and others. In Piano songs, there are works using classical format such as “Piano Sonata” (1947) and “Suite for Children”.