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This Jazz Piano Tutorial is about Harmonic Rhythm.
Songs have a given beat, and the melody takes on a specific rhythm on top of the beat. The harmony (that is, the chords) also takes on a specific rhythm on top of the bear and this is called the ‘Harmonic Rhythm’.
The Harmonic Rhythm is the ‘rate at which the chords change’.
This is quite an interesting and important topic because it influences the strength of a chord progression and even the function of a chord.
We hear chords in Groups of 4. And we can allocate a relative strength to each of the chords in that Group of 4. This looks as follows:
S W s w;
where 'S' is greater than 's' is greater than 'W' is greater than 'w'
As I mentioned before, the Harmonic Rhythm affects how strong a chord progression sounds; or more specifically how strong a cadence sounds. And the most common cadence is a V7-I perfect (authentic) cadence.
A V7-I cadence sounds stronger if the V7 chord is on a relatively weaker beat than the I chord.
So a stronger chord progression has a V7 on a weak beat resolving to a I on a stronger beat. And if you have a look across various Jazz Standards you will find that this is the case around 95% of the time.
And in fact, the location of the V7 chord in relation to the Harmonic Rhythm can even affect the ‘function‘ of the V chord. That is, the usual ‘function’ of a V7 chord is to resolve down a 5th to the I chord (like a G7 resolving to a C). The function of the G7 (it’s whole purposes or point in life) is to move to the C (the Tonic Chord). For a V7 to sound like it is in a Cadence (V7 of a V7-I) it generally needs to be on a weak Harmonic Rhythm beat.
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