What are the differences between the four types of cadence?
A perfect cadence is chords V-I. When there is a perfect cadence the music sounds finished.
An imperfect cadence is any chord moving to V (e.g. I-V, II-V, IV-V). The music does not sound finished.
An interrupted cadence is chords V-VI. These chords sound as though they are about to be a perfect cadence (i.e. end up on chord I) but end up moving to chord VI.
A plagal cadence is chords IV-I. It is known as sounding like an 'Amen' chord due to its prominence in religious choral music.
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