  
4
Octave
The distance between two pitches having the same name is called
an octave. If
you play successive pitches on the white keys of a piano, there
comes a point at which the pitch seems to duplicate an earlier pitch.
The two pitches are said to be an octave apart. Notice that the
pitches will have the same letter name (as learned in the section
about the piano keyboard). Men
and women instinctively sing an octave (or possibly two octaves)
apart.

  
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