Ben Johnston’s String Quartet No. 4, “Amazing Grace”: The Kronos Quartet
American composer Ben Johnston (1926-2019) was a pioneer of just intonation (pure intervals tuned as whole number ratios) and microtonality (the use of intervals smaller than a half step). At the age of 17, following a concert of his music, Johnston gave an interview in which he predicted, “with the clarification of the scale which physics has given to music there will be new instruments with new tones and overtones.” He went …