Combining the tuning techniques of the traditional Japanese music thus learned and his own tuning techniques of modern koto music, Yoshizawa came up with 'kokinchoshi' scale that is a combination of both systems of ritsu scale (anhemitonic pentatonic scale) in the traditional Japanese music and miyako-bushi scale (characteristic Japanese hemitonic pentatonic scale: mi, fa, la, ti, do) in the modern Japanese music.
こうして吉沢は学んだ雅楽の調弦と、自分たちのものである近世箏曲の調弦を合わせ、雅楽の律音階と近世邦楽の都節音階の両システムを折衷した「古今調子」を編み出した。