Although the indication of 8va is widely used, this indication is rarely used. When it is relatively easy for a performer to play one octave higher than the written notes, transposing two octaves higher is much more difficult.
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.
Also 15.
Play 15ma Example #1 (MIDI file format) |
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Play 15ma Example #2 (MIDI file format) |