84.107Apply it to “Mack the Knife”

This is ideal for modulation architecture.

Early chorus: original key.

Later chorus: same tune one semitone higher.

But instead of simply jumping every time, try several approaches:

• dominant pickup into new key
• hard stop + direct lift
• walking bass chromatic bridge
• same comping rhythm through modulation

The tune's repeated-chorus design makes key change an excellent intensity tool.