26.95Arrangement blueprint

Intro

one dark chromatic gesture.

First statement

very sparse.

Repeated phrase

one inner semitone line.

Middle

clear minor iiø–V.

Later statement

one diminished approach.

Climax

altered dominant + wider register.

Release

melody and bass only.

Tag

short chromatic motif.

Ending

Cm6/9 or Cm(maj9), depending whether you want closure or ambiguity.