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In classical music from Western culture, a seventh is a musical interval encompassing seven staff positions, and the minor seventh is one of two commonly occurring sevenths. It is qualified as ''minor'' because it is the smaller of the two: the minor seventh spans ten semitones, the major seventh eleven. For example, the interval from A to G is a minor seventh, as the note G lies ten semitones above A, and there are seven staff positions from A to G. Diminished and augmented sevenths span the same number of staff positions, but consist of a different number of semitones (nine and twelve). Minor seventh intervals are rarely featured in melodies (and especially in their openings) but occur more often than major sevenths. The best-known example, in part due to its frequent use in theory classes, is found between the first two words of the phrase "There's a place for us" in the song "Somewhere" in ''West Side Story''.〔Neely, Blake (2009). ''Piano For Dummies'', p.201. ISBN 0-470-49644-4.〕 Another well-known example occurs between the first two notes of the introduction to the main theme music from ''Star Trek: The Original Series'' theme.〔Keith Wyatt, Carl Schroeder, Joe Elliott (2005). ''Ear Training for the Contemporary Musician'', p.69. ISBN 0-7935-8193-1.〕 The most common occurrence of the minor seventh is built on the root of the prevailing key's dominant triad, producing the all-important dominant seventh chord. Consonance and dissonance are relative, depending on context, the minor seventh being defined as a dissonance requiring resolution to a consonance.〔Benward & Saker (2003). ''Music: In Theory and Practice'', Vol. I, p.53. Seventh Edition. ISBN 978-0-07-294262-0.〕 ==In other temperaments== In just intonation there is both a 16:9 "small just minor seventh", also called "Pythagorean small minor seventh",〔"On Certain Novel Aspects of Harmony", p.119. Eustace J. Breakspeare. ''Proceedings of the Musical Association'', 13th Sess., (1886 - 1887), pp. 113-131. Published by: Oxford University Press on behalf of the Royal Musical Association.〕 () and a 9:5 "large just minor seventh" ().〔"The Heritage of Greece in Music", p.89. Wilfrid Perrett. ''Proceedings of the Musical Association'', 58th Sess., (1931 - 1932), pp. 85-103. Published by: Oxford University Press on behalf of the Royal Musical Association.〕〔Partch, Harry (1979). ''Genesis of a Music'', p.68. ISBN 0-306-80106-X.〕 An interval close in frequency is the harmonic seventh.〔David Dunn, 2000. (Harry Partch: an anthology of critical perspectives ).〕 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「Minor seventh」の詳細全文を読む スポンサード リンク
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