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Music Theory for Computer Musicians by Michael Hewitt

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The Dominant Seventh Chord

The most popular and frequently used seventh chord is the dominant seventh chord, which occurs on the fifth degree of either the major or the minor scale (chord G7 in Figure 21.8). For this reason, the chords of C and G7 are often the first two chords that guitarists learn to play. These chords play a crucial part in so many songs that this makes sense. The reason for the popularity of the dominant seventh chord lies in the strength of its resolution to the tonic triad. Earlier we talked about the perfect cadence, a progression from chord V to the tonic of either major or minor key. When a seventh is added to the dominant triad, the perfect cadence is even more incisive and final. Primarily, this is because of the ...

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