80.100Apply it to “Mack the Knife”

For a darker intro before the familiar swing statement:

avoid clear major 3rd.

Use:

open fifths

sus sonorities

perhaps quartal RH over tonic pedal.

Let the melody enter recognizable but harmonically ambiguous.

Then:

reveal the conventional major/swing world with a clear 3rd and walking bass.

The contrast will make the main arrangement feel brighter without changing the melody.