This indication is rarely used because of the difficuly that performers generally have in transposing two octaves lower.
It should also be noted that since an octave is eight notes and two octaves, being twice the interval, should be 16 notes. After careful examination, it becomes clear that the last note of the first octave is the same as the first note in the second octave, so there are only 15 notes in a two octave interval.
Play 15mb Example #1 (MIDI file format) |
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Play 15mb Example #2 (MIDI file format) |