The definition of functional harmony submits that dominant chords point towards tonic and that other chords progress to particular places that ultimately lead back to the tonic.
While playing the piano we observe that progressions move in 2-5-1 mode
A major 2-5-1
or
A minor 2-5-1
Example let’s look at a Major ii-v-i in the key of C
LH RH
D F A C E
G F A B E
C E G B D
One could cause a deceptive resolution in this progression before arriving on the tonic chord.
Let’s look at some of these resolutions
Expected Resolution: ii-v-i
Unexpected Resolution: ii-v-vi
More Unexpected Resolution: ii-v-biMaj7-v-i // ii-ivMin7-iii
Unexpected Resolutions in Key C
ii-v-vi
LH RH
D F A C E
G F A B E
A G B D
More Unexpected Resolutions in Key C
ii-v-bvi Maj7-v-i
LH RH
D F A C E
G F A B E
Ab Bb C Eb G
G A C E G
C G B D G
ii-ivmin7-iii
LH RH
D C F A
F Eb G Ab C
E D G B
