Keiko Nosaka (1938–2019) was a pioneering Japanese koto performer renowned for redefining the instrument’s expressive potential. A student of Michio Miyagi, she became celebrated for introducing the 20-string koto, expanding both its range and modern repertoire. Deeply dedicated to contemporary music, Nosaka collaborated with leading composers to create innovative works that bridged tradition and experimentation. Her artistry and technical mastery established her as a vital force in 20th-century Japanese music, inspiring a new generation of musicians and expanding global appreciation for the koto.