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The rule of the octave is a way of harmonizing each note of the diatonic scale, reflecting common practice, and has its origin in the practice of thorough bass, or basso continuo. The rule of the octave was first mentioned in the 17th century in treatises for thorough bass written for lute-like instruments. There is normally a different harmonization for ascending and descending bass lines, and, although called a rule, there are several variants with different chords. One example for the major scale by John Hiles:〔Hiles, John (1882). ''A catechism of harmony, thorough-bass, and modulation, with examples'', p. 82.〕 \new PianoStaff << \new Staff } \new Staff } \new FiguredBass \new Lyrics >> ==Sources== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rule of the octave」の詳細全文を読む スポンサード リンク
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