The ? (gamma) scale is a non-octave repeating musical scale. In one interpretation, it splits the perfect fifth into 20 equal parts of approximately 35.1 cents each. In another, it splits the neutral third into two equal parts, or ten equal parts of approximately 35.1 cents eachPlay (help·info). At 35.1 cents per step this totals 34.188 steps per octave. More accurately, but still approximately, the gamma scale step is 35.099 cents and there are 34.1895 per octave.