Suggested Learning Resources
- If the root note of a chord is a 3rd above, or below, the root of the
chord that precedes it, to the two chords have an ascending, or descending, 3rdroot
motion relationship respectively.
- Chords possessing the descending third relationship include (I – vi) (vi
– IV) (IV – ii) (ii – vii) (vii – V) (V – iii) (iii – I)
- Chords possessing the ascending third relationship include (I – iii) (iii
– V) (V – vii) (vii – ii) (ii – IV) (IV – vi) (vi – I)
- IMPORTANT: In written notation, the bass of the second chord does not
actually have to ascend or descend by a 3rd in order for the two chords to have this
relationship (example: I – vi6 is a descending 3rd by root motion relationship,
even though the written bass motion is likely a unison or octave)
https://youtu.be/FC5XUmeEgBk?t=9m27s
Objective 20.4: Identify chords that possess a descending 3rd root motion relationship