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The Major Scale generates a family of seven
scale tone chords. [revise:
Tutorial 4]
While all or any of the seven chords may be used to
express a particular tonality, jazz composers tend
to use the II V I progression most frequently. The
II V I progression is the basic harmonic building
block for the bulk of the standard jazz
repertoire.
This "building block" is often used in "incomplete"
forms such as II V, V I or even individual II, V or
I chords.
In ex.1, the partial building block II V is used in
a variety of keys. The piece only comes to rest in
measure 7 where we briefly encounter a I chord for
the first time. The chords then quickly move away
descending in half steps to set up a "Turnback" or
"Turnaround" to Cmi7.
In ex.2, the complete II V I building block is
used.
In ex.3, the partial building block V I is used in
a variety of keys. Here the key centres are
descending in major 3rd intervals (keys of B, G and
Eb). Identifying the intervallic relationships
between the various key centres is vital to
understanding the structure of a piece.
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