Day 18.

Dominant 7th group: When the b7th is present it is common to label a chord by the number of its highest extension.

~~~~~~~~~ P o s i t i o n s

seventh~~~1~~~3~~~~~~5~~~b7 (Just called the 'seventh').

ninth~~~~ 1~~~3~~~~~~5~~~b7~~~9

eleventh~~~1~~~3 (op)~~~ 5~~~b7~~~9 (op)~ 11~~~~~~~~(Often the 3rd is left out or a 4th can be substituted for the 11th).

eleventh~~~1~~~~~~~~~ 5~~~b7~~~9~~~~11~~~~~~~~(3rd left out).

eleventh~~~1~~~~~~4~~~5~~~b7~~~9~~~~~~~~~~~~~(4th substituted for the 11th).

thirteenth~~ 1~~~3~~~~~~5~~~b7~~~9 (op)~ 11 (op)~~13

Other dominant 7 chords:

7 b5~~~~~ 1~~~3~~~b5~~~b7~~~~~~~~~~~~~(Sometimes notated 7-5)

7 #5~~~~~1~~~3~~~#5~~~b7~~~~~~~~~~~~~(Seventh sharp 5th).

7 b9~~~~~ 1~~~3~~~ 5~~~ b7~~~b9~~~~~~~~~(7 flat 9, sometimes notated 7 - 9 ).

7 #9~~~~~1~~~3~~~ 5~~~ b7~~~#9~~~~~~~~~(7 sharp 9).

7 #5 #9~~~1~~~3~~~#5~~~b7~~~#9~~~~~~~~~(7 sharp 5 sharp 9).

7 #5 b9~~~ 1~~~3~~~#5~~~b7~~~b9~~~~~~~~~(7 sharp 5 flat 9).

7 b5 #9~~~ 1~~~3~~~b5~~~ b7~~~#9~~~~~~~~~(7 flat 5 sharp 9).

7 b5 b9~~~~1~~~3~~~b5~~~b7~~~b9~~~~~~~~~(7 flat 5 flat 9).

7 #11~~~~ 1~~~3~~~ 5 ~~~ b7~~~9 (op)~~~#11~~(7 sharp 11).

9 b5~~~~~ 1~~~3~~~ b5~~~b7~~~ 9~~~~~~~~~~(9 flat 5).

9 #5~~~~~ 1~~~3~~~#5~~~b7~~~9~~~~~~~~~~(9 sharp 5).

End of day 18.