ocr: ABOUT INTERVALS An interval is the perceived distance between two pitches. If two pitches are identical they are in unison. If they belong to the same Ditch-class then they are separated by one or more octaves. Since there are twelve pitches within an octave there are twelve possible intervals within an octave. The number association describing an interval refers to the number of letter-names involved. A to B or B to C is a second even though they have different size intervals. A to B - is a whole step and B to C is a half step. A third always spans 3 - letters, a fourth spans 4 letters and sO ...
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