Final answer:
During the Edo period, koto music flourished and saw a growth in composition and innovation.
Step-by-step explanation:
During the Edo period in Japan (1615-1868), there was a flourishing of koto music and composition. This period was characterized by economic growth, stability, and a thriving cultural scene. Koto music, which is a traditional Japanese stringed instrument, experienced a surge in popularity and innovation during this time. Musicians composed new pieces and techniques for the koto, contributing to the development and diversification of koto music.