The common chord of the dominant note in a key, plus the diminished seventh from that note (e.g. in the key of C, a chord of G-B-D-F). It is important in conventional harmony, as it naturally resolves to the tonic or subdominant.
- This is an odd turn of events, since it wasn't all that long ago that the phrase ‘musical meaning’ either referred to formal properties - is this chord a dominant seventh or a German sixth, and how do we know?
- When one reduces the musical texture to its harmonic frame, four dominant seventh chords remain, of which only the last one is resolved in G minor.
- The noble falling fourths, echoed by the piano, re-establish the tonic key unambiguously, the bass triads wavering between tonic D majors and first inversions of the dominant seventh.
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