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<p>The octave relationship is a natural phenomenon that has been referred to as the "basic miracle of music", the use of which is "common in most musical systems". The interval between the first and second harmonics of the <a href="page.php?w=Harmonic_series_%28music%29">harmonic series</a> is an octave. In Western <a href="page.php?w=Musical_notation">music notation</a>, notes separated by an octave (or multiple octaves) have the same <a href="page.php?w=Musical_note">name</a> and are of the same <a href="page.php?w=pitch_class">pitch class</a>.</p><p>
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