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Coltrane substitution

thumbThe Coltrane substitution, Coltrane changes, or Countdown formula, is as follows. Start with a ii-V-I turnaround lasting four measures:
:} || | Dm⁷ || | || | G⁷ || | || | C || | || | C || | |}with the dominant chord (V⁷) preceding the tonic (I).

One substitutes two chords for each of the first three:
:} || | Dm⁷ || | || | E⁷ || |

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