Overview

Eb for first vocal, F for last vocal.

Decided to avoid the classic transpose up directly, using a middle section in Bb. Bb is a common chord between start and end keys.

Rhythm

Style with emphasis on the horns laying down the groove.

Voicings

Closed voicings.

Use diatonic passing chords.

Key Structure

Starting in Eb (3 flats), to Bb (2 flats), to F (1 flat).