Crossword clues for the word: QUARTERTONE The word QUARTERTONE has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for QUARTERTONE Showing 1 to 5 of 5 results Clue(s) 1/24 of an octave Half of a half step in music Small music interval Small musical interval Small musical interval sung in choral warmups