Cadences
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At the end of a phrase or passage of music specific chords can be selected to produce an ending. This is generally explained as the punctuation of music, the Full Stop, Comma or Semicolon, which gives a logical sounding ending. These are called Cadences. The most famous cadence is the Amen, which is sometimes sung in churches at the end of a hymn. These Cadences can be long and drawn out.

In music there are standard cadence types. The traditional way of learning about cadences was to use numbered chords, mostly triads, in example keys.

First I will use the triads of C major and give out the modern chord names for them.

Key C major
 

Triad
Number
I
II
III
IV
V
VI
VII
Notes
In The
Triad
G
E
C
A
F
D
B
G
E
C
A
F
D
B
G
E
C
A
F
D
B
 
Root
Supertonic
Mediant
Subdominant
Dominant
Submediant
Leading Note
Modern
Chord
Name
C major
D minor
E minor
F major
G major
A minor
B diminished

1) Perfect cadence or Full close
V - I
G major followed By C major.
This cadence is generally thought of as the full stop. It it the final ending. And very definite sounding.

2) Plagal Cadence
IV - I
F major followed by C major
This one is also a full stop, but a more playful one.

3) Imperfect Cadence or Half Close
I - V  C major followed by G major
or IV - V F major followed by G major

These cadences point to the end of the phrase, but suggest that there's more to come.

4) Interrupted Cadence or abrupt cadence
V - VI
G major followed by A minor
Leaving a surprise, the listener hears the music coming to an end and expects to hear a tonic, but another chord is there instead.

5) Phrygian Cadence ( a )

A cadence which starts fron the Major Key, and ends with a chord on the dominant of the relative minor key.

6) Phrygian Cadence ( b )

Any sort of imperfect cadence in a minor mode

7) Phrygian Cadence ( c )

The first inversion of IV followed by I

A     G
C  -  B
F      D