In addition to
Soujirou's writeup about inversions in
music, there is a
shorthand for writing inversions, and an additional inversion for every extension
note added to the
chord.
First, this
shorthand involves the
chord name followed by a subscript
number. If the
chord is G
Major and it is in
first inversion, then we can call it a G
6, since the
third on bottom and
root on top makes a sixth, and the third to fifth makes a third, but that is implied, so we simply call it a G6
chord.
The
Second inversion can be called a G
64, because there is a sixth between the fifth on bottom and the third on top, and a fourth between the fifth on bottom and the root in the middle.
( As a side
note,
people often make the two
numbers
vertical instead of side by side.)
In
Seventh chords, we get another
inversion, because there is another note. Now, first inversions are shortened to 65, to imply the
seventh now included... A
seventh chord Second inversion is a 653, but shortened to 63. And the new Third
inversion is a 643 chord, but shortened to 43.
There is also One new
inversion for the
Ninth chord, another for the
Eleventh, and another for the
Thirteenth chord. These may be talked about later.....