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In music theory, a leading-note (also subsemitone, and called the leading-''tone'' in the US) is a note or pitch which resolves or "leads" to a note one semitone higher or lower, being a lower and upper leading-tone, respectively. More narrowly, ''the'' leading tone is the seventh scale degree of the diatonic scale, with a strong affinity for and leading melodically to the tonic . It is sung as ti in movable-do solfège. For example, in the C major scale (white keys on a piano, starting on C), the leading note is the note B; and the leading note chord uses the notes B, D, and F: a diminished triad. In music theory, the leading note triad is symbolized by the Roman numeral vii. By contrast, an upper leading-tone (; ), which leads ''down'', may be found as the seventh of the dominant seventh chord, which leads to the third of the tonic chord (in C: F of a G7 chord leads to E of a CM chord). The upper leading-tone may also be found above the tonic, on D or C in C. ==Tonality== According to Ernst the major and minor thirds contain "latent" tendencies towards the perfect fourth and whole-tone, respectively, and thus establish tonality. However, Carl shows that this drive is in fact created through or with harmonic function, a root progression in another voice by a whole-tone or fifth, or melodically (monophonically) by the context of the scale. For example, the leading note of alternating C chord and F minor chords is either the note E leading to F, if F is tonic, or A leading to G, if C is tonic. In works from the 14th- and 15th-century Western tradition, the leading-note is created by the progression from imperfect to perfect dissonances, such as a major third to a perfect fifth or minor third to a unison. The same pitch outside of the imperfect consonance is not a leading note. The leading-tone seventh chords are in major and in minor . As a diatonic function the leading-note is the seventh scale degree of any diatonic scale when the distance between it and the tonic is a single semitone. In diatonic scales where there is a whole tone between the seventh scale degree and the tonic, such as the Mixolydian mode, the seventh degree is called, instead, the subtonic. 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「Leading-tone」の詳細全文を読む スポンサード リンク
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