Leading-Tone Seventh

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2/21/2011 Leading-tone Seventh Chords Leading-Tone Seventh Chords One of the most common types of seventh chords is the leading-tone seventh chord, which has a dominant function like the V7 Its root is the leading-tone (scale degree 7) In major, the leading-tone seventh chord is half-diminished (viiØ‡) ◦ Also known as diminished-minor because it contains a diminished triad and a minor seventh ◦ In other words, it is a diminished triad with a major third on top (m m M) Leading-tone Seventh Chords Resolving the LTDS In minor, the leading-tone seventh chord is Both leading-tone seventh chords usually move fully-diminished (viiø‡) directly to I (i) ◦ Also known as diminished-diminished because it ◦ The leading tone root always resolves up contains a diminished triad and a diminished seventh ◦ The seventh always resolves down ◦ In other words, it contains all minor thirds (m m m) ◦ Never double the root of this chord In minor keys, you have to raise the root of the (since it is the leading tone) viiø‡ chord, because the root is supposed to be You can also alter just one of the notes so that the leading tone it becomes a dominant seventh—this The fully diminished seventh chord creates a strengthens its dominant function good deal of harmonic tension Voice-leading the LTDS The voice-leading for the LTDS is usually quite smooth, with the voices all resolving by step ◦ Resolve the tendency tones first: leading tone up, seventh down The viiø‡ chord has two tritones in it—these tend to resolve in, which would result in a doubled third in the I chord ◦ However, composers more often use unequal fifths in resolving viiø‡ to I, doubling the root Beware of parallel fifths when resolving viiØ‡ to I 1.

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