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Music Theory for Computer Musicians by Michael Hewitt

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Harmony

To acquire a knowledge of harmony, you need to know about the chords that are used in chord progressions. It is important to realize that triads of three notes form the basic units of any chord progression. Detailed knowledge of these is essential for those wishing to write their own music, especially since all other more complex chords used in chord progressions (such as sevenths, added sixth chords, ninths, and so on) build upon this foundation of triadic harmony.

Recall that a triad has three notes, each of which can be named as follows:

CEG
RootThirdFifth

The root is the most important note of a chord. Without a root, it would be impossible for the ear to tell which chord one is. So the root is the note from which the chord acquires ...

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