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The tonic's seventh is both the seventh of the chord and the leading tone of the scale. So what should happen with this seventh if it needs to be raised or lowered?

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What do you mean by "needs to be raised or lowered?". Can you give an example? –  Dom Jan 14 at 14:32
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the seventh of a chord is lowered when used. The leading tone is usually raised to resolve. –  Neil Meyer Jan 14 at 14:46
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Neil, your claim of "lowered when used" begs for citation. I think you'll find plenty of music with 7 or flat7 applications. Augmented7 possibilities I'll leave to those who survived Hindemith's theory book. –  Carl Witthoft Jan 14 at 15:33
    
library.thinkquest.org/C0113187/en/html/theory/… is what I mean the resolution of seventh chords part. –  Neil Meyer Jan 14 at 15:39

2 Answers 2

In general, the tonic seventh is built in the scale it is used in. So the major scale tonic chord 7th is usually is a Major 7th and the minor natural scale tonic 7th chord is usually a minor 7th. Both of these chords are more for ornamentation than for resolution so the normal theory applies to the tonic and it's seventh where the tonic can pretty much go anywhere. There are special cases for each of these though.

In major it is common to see the tonic chord have a lowered 7th and become the a dominant 7th. In this case the tonic chord is acting more like a dominant and resolves to the subdominant as the dominant would resolve to the tonic. So in analysis the progression would be looked at as V7/IV to IV. In this case you are borrowing from the key of the subdominat so for the V7/IV the scale to harmonize with it would be that of the subdominant and would return to the scale of the tonic once the IV was played.

In the harmonic and melodic minor scale, the 7th is usually raised to signify a return to tonic. This sometimes will apply to the construction of a 7th chord of the tonic chord. While this may be, is not used in classic counterpoint because it creates an augmented interval from the 3rd to the 7th.

So the only real difference is if the tonic is dominant seventh then it is best to resolve to the subdomintant. Besides that treat it like a tonic like normal.

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3rd para - harmonic and melodic will have a 'raised seventh', the natural is the one that doesn't. –  Tim Jan 17 at 11:15
    
@Tim thanks. I fixed it. –  Dom Jan 18 at 16:48

If you're talking about a diatonic I chord in a major key with a seventh, then I think you're talking about the apparent conflict between the need for a leading tone to resolve up and for a harmonic seventh to resolve down. The answer, at least for common practice tonality, is that the note's role as harmonic seventh supersedes its status as leading tone—it should resolve down to the sixth scale degree in the next harmony. Most often the harmonic change will be to ii or IV.

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Thank You Pat that is exactly what I mean. –  Neil Meyer Jan 19 at 10:52

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