Inside Lyra’s Theme: Modal Mixture and Withheld Resolution
Alexandre Desplat’s Epilogue from The Golden Compass features a quiet, almost prayerful statement of Lyra’s theme, built on the most familiar shape in tonal music: I, vi, IV, V in B-flat major, repeated. What makes the cue worth close listening is everything Desplat does inside that loop without leaving it, and there are five compositional decisions worth taking from it.
The structural arc
| Cycle | Variant | Distinctive |
|---|---|---|
| 1 | Bb, G min, Eb, F | Plain triads, the unornamented baseline |
| 2 | Bb maj7, G min7, Eb maj9, F dom7 | Extensions throughout, ending on V7 |
| 3 | G min, Eb, D min7, Eb, Bb maj7 | iii7 weaves under IV before resolving |
| 4 | C min (ii), Eb min in harmonic major | First modal mixture, plagal into the recap |
| 5 | Bb, G min, Eb, F | The opening triadic statement, restated |
| 6 | Bb, Bb maj7, G min7, Eb maj7, Eb min (aeolian), Eb min (harmonic major) | The deepest mixture passage, plagal close |
| Coda 1 | Bb, Eb, F, Bb | Stripped IV-V-I |
| Coda 2 | Eb, F, F dom7, Bb | The final perfect authentic cadence |
A plain statement, an extended statement that breaks open, a descending variant, a modal-mixture peak, a recap, a deeper modal-mixture peak, then a clean cadential close.
Built on a familiar loop
The cue’s foundation is the most familiar shape in tonal music:
Bb maj (I), G min (vi), Eb maj (IV), F maj (V)
Across the Main Theme this loop returns six times, each pass reshaping the four chords with a different intention. The Coda restates the loop twice more in stripped-back form before closing on a single perfect cadence. Everything that follows — the modal mixture, the deceptive cadence, the held-back dominant seventh — happens inside this loop without ever leaving it.
A borrowed chord used three times
The most striking move in Epilogue is the appearance of Eb min as a borrowed iv. Modal mixture, the technique of pulling a chord from a parallel mode of the home key to colour the harmony, is a familiar device, and Desplat’s discipline is in how rarely he uses it. Across the cue’s seven cycles of the loop, Eb min appears three times: at the heart of cycle 4, twice in cycle 6, and nowhere else.
Each placement falls on a structural moment. The first arrival, in cycle 4, marks the first interruption of the diatonic loop and ends the section with a plagal cadence, the IV-to-I gesture more familiar from hymn endings, that pulls the recap back home. The second pair, in cycle 6, sits at the deepest passage of the piece; the third appearance resolves the second one a bar later. Together they form a single dramatic climax, not a recurring colour.
We might say the discipline is what makes the chord land. If Eb min appeared in every cycle, it would shade the cue’s mood toward minor and stop being a surprise. By holding it to three placements aligned with structural beats, Desplat lets the chord function as a structural event rather than a tint.
The same chord, three lights
The three Eb min appearances share their notes, Eb-Gb-Bb, but not their setting. Each one sits inside a different parallel mode of B-flat: scales built on the same tonic, differing only in their inner degrees. The scale around the chord is what gives the chord its character.
The first sits inside Bb harmonic major (Bb, C, D, Eb, F, Gb, A), the home scale with a flat sixth. Only the Gb has been borrowed from the parallel minor; the major third and leading tone of the home key both stay in place. The shift away from the surrounding ionian is small, a single shading darker, and most of the home key is still in the room.
The second drops further, into Bb aeolian (Bb, C, Db, Eb, F, Gb, Ab), the parallel natural minor. Three notes are now borrowed at once: Db, Gb, and Ab. This is the largest scale move in the cue by a clear margin, and the harmony darkens audibly even though the chord on top has not changed at all. Notice the asymmetry: the chord stays where it was, and the world around it is what moves.
The third appearance comes one bar later. The chord stays as Eb min, but the scale lifts back into Bb harmonic major, a marked brightening with no change in the chord tones, and the plagal cadence then pulls iv to I. The same triad goes dark, opens halfway, and resolves, all without a single chord tone moving.
A single deceptive turn
A deceptive cadence is a dominant chord that resolves to something other than the expected tonic, postponing closure when the ear is most prepared for it. The Main Theme of Epilogue contains exactly one, and Desplat places it at the seam between the second and third cycles. F dom7 moves to G min instead of the expected I, the F7 tritone collapsing into a plain minor triad, and the resolution we were preparing for is quietly withheld.
We might say this single refusal is what holds the second cycle open and lets the piece keep developing instead of closing early. Across the rest of the cue’s thirty-four moves, every other dominant gesture either resolves cleanly to tonic or hands off as a half cadence. Desplat declines to land once, at the structural midpoint, and the rest of the piece exists because of it.
Saving the seventh for the end
The dominant seventh appears twice across the cue. The first time, in cycle 2, it produces the deceptive cadence and is denied its resolution. The second, in the Coda, F dom7 → Bb maj is finally allowed to resolve, and that resolution is the last move of the piece. Desplat holds the dominant seventh’s actual landing back through the entire arc, so when it arrives, it is the one fully resolved gesture in the cue.
What you can learn from it
- Build the whole piece on a familiar loop. Let voicing, extension, and scale choice carry the variation.
- Borrow sparingly and structurally. Use a borrowed chord rarely enough that each appearance reads as a structural event rather than a colour.
- Voice the same borrowed chord through different parallel scales. The same triad deepens or lightens depending on the mode it sits inside, without moving a single chord tone.
- Place a single deceptive cadence at the structural midpoint. The moment of non-resolution becomes the engine for what follows.
- Hold the dominant seventh’s resolution back until the very end. The one fully resolved gesture in the cue is then its last.
Explore the template
The full progression of Lyra’s Theme, region by region, is available as a template in Orphere Studio. Load our template to step through every chord change and see how three appearances of a single borrowed iv chord, drawn from three different parallel scales, reshape the same I, vi, IV, V loop.