Le Sud — Nino Ferrer, 1975

Colour = how much the chord demands to continue, graded by its function against the key of its own bar — darker means more: rest (I)partial rest (vi, iii; in a minor key bVI, bIII)departure (IV, ii, borrowed; in a minor key iv, ii°, v)peak (V, vii°, secondary dominants, bVII)…plus an add or sus note. A chord from outside the key wears a dashed edge; it takes a rung like any other rather than sitting off the scale.  Pill under a chord = how surprising its arrival is — the fuller, the rarer the move; red when really rare. Click it for the numbers.  Grey block = a chord the software read but published no degree for; it prints the best-guess chord name where the shape supports one, else the shape. Only chords we are at least quite sure of are shown.  Dashed magenta = a bar where a restatement differs. → authentic cadence  ↷ secondary dominant resolving  ⇝ plain falling fifth.