APFIVE How does the quality of the seventh chord built on the fifth scale degree differ between major and minor keys, and what implications does this have for harmonic function?
In major keys, it’s a half-diminished seventh chord; in minor keys, it’s a fully diminished seventh chord. This impacts its resolution tendencies.
In major keys, it’s a minor seventh chord; in minor keys, it’s a dominant seventh chord. This alters its role in cadential progressions.
The quality is the same in both major and minor keys, but the seventh is raised in minor keys to create a leading tone.
In major keys, it’s a dominant seventh chord; in minor keys, it’s a minor seventh chord. This affects its strength as a dominant function chord.
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