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Published online by Cambridge University Press: 27 October 2009
1 The seven species of the octave are the familiar seven forms of the octave which can be extracted from the white keys of the piano; they vary in the positions of the semitones; difference of pitch is immaterial. ‘Gapped scales’, referred to later, may be roughly illustrated by the ‘pentatonic’ scale (compass an octave, but containing only five notes) which gives so marked an ethos to many Gaelic melodies. A. is Aristoxenus; A. Q. Aristides Quintilianus.