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Music Theory for Computer Musicians by Michael Hewitt

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Sevenths in the C Major Scale

Applying this procedure to the C major scale, you obtain a series of six other seventh chords (in addition to the chord of Cmaj7 we just considered). See Figure 21.8.

Figure 21.8. Seventh chords in the key of C major.

Some of these chords have a major seventh, as in C E G B, while others use a minor seventh, as in D F A C. What is the difference? The major seventh has 11 semitones and is quite a sharp dissonance, whereas the minor seventh has 10 semitones and, although dissonant, is much mellower in its sound.

This means that there are two kinds of seventh chords: chords of the major seventh ...

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