OCTAVES
octave, in music, a stretch whose higher note has a sound-wave recurrence of vibration two times that of its lower note. Many melodic scales incorporate an octave; in the diatonic scales (major, minor, and modular) of Western music, the octave is a time frame notes.
An octave is the stretch included 12 half moves forward from a beginning note. It is called an octave since it is commonly addressed as a component of a 7-note scale. A 7-note scale has 8 notes in fact, however there are 7 diverse note names in the scale, since the eighth note is equivalent to the primary note.
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