Principles of Voice Leading 2
Plagal Cadences
Voice leading for plagal cadences are very simple, compared with voice leading for authentic cadences. Since there is a strong note shared between the two harmonies, the basic movements are:
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Deceptive Cadences
Since deceptive cadences are variants on authentic cadences, the main consideration is that, since the bass moves up by step, one must avoided parallel movement between the bass line and any other voice.
The deceptive cadence most often resolves to a root position submediant chord, since the entire effect is based on the deceptive motion of V to vi. This is best expressed when the submediant chord is in root position.