Harmonic progression
The process of relating chords within the scale to where they naturally lead
Progression
When the harmonies proceed from a stable beginning (tonic function), move forward through progressively more active chords (predominant and dominant function), including seventh chords to end (resolve) with stability
Circle progression
The movement of chords where the root of each chord is a diatonic fifth above the next chord
Progression by thirds
The movement of chords where the root of each chord is either up or down by a third
Progression by seconds
The movement of chords where the root of each chord is either up or down to the next note in the scale
RETROgression
When harmonies move backwards from this concept T-D-S-T (a root position V to a root position IV)
Harmonic rhythm
The rate at which harmony changes
the more a chord is inverted
the weaker its function or the more it functions like another chord.
Types of second inversion chords
Passing
Pedal
Arpeggiated
Cadential
Rules for RETROgression
Don’t follow V with IV, ii6 or ii6/5.
Don’t follow vi (VI) with I (i) because the tonic chord is more stable, less tense than IV.
Don’t follow ii with IV. They’re not equal in tension.