quarter tone
Noun
Meaning
half of a semitone
Source: WordNetAlternative names
quarter-tone
Synonyms
Hypernyms
Examples
These "moderns" were discarding the old laws of composition and experimenting with new forms, harmonies and rhythms, and including the use of jazz and quarter-tone music.
Various composers including Charles Ives experimented with music for quarter-tone pianos.
For instance, three pure major thirds stack up to 125/64, which at 1158.94 cents is nearly a quarter tone away from the octave.
Arabic music maqamat may use quarter tone intervals.
Thus, the first and third valves used in combination lower the pitch by something just short of five semitones, and the first three valves used in combination are nearly a quarter tone sharp.
Some instruments feature a fourth valve that provides a quarter-tone step between each note.