I. Authentic cadence: V to I.
A. Perfect authentic cadence (PAC): The chords are in root position; that is, the roots of both chords are in the bass, and the root of the final chord is in the highest voice. A PAC is a progression from V to I in major keys, and V to i in minor keys.
B. Imperfect authentic cadence (IAC):
1. Root position IAC: the highest voice is not the tonic
2. Inverted IAC: one or both chords must be inverted
3. Leading tone IAC: V is replaced with vii°
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Authentic:
V-I, V-i
Plagal:
IV-I, iv-i
Half:
x-V
Deceptive:
V-(VI), V-(vi)
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