Sonata for Microtonal Piano is a sonata for specifically microtonally tuned piano by Ben Johnston written in 1964 (see also just intonation). When the movements are played in an alternate order the piece is titled Grindlemusic. In the words of the composer: The piece has been recorded and released on: * Microtonal Piano by Ben Johnston (1997). Phillip Bush, piano. Koch International Classics 3-7369-2.