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• n  half of a semitone

• But it was the quarter-tone pianothe piano of tomorrow, according to Pianist Earthwhich amazed.
• Any young jazz player can certainly stand some formal polishing of his delayed triplets, skimmed notes, quarter-tone vibratos and other "words" in the jazz vocabulary.
• Inventor-Pianist Hans Barth played for them on his quarter-tone piano.

• quarter tone