O Magnum Mysterium — reimagined in D A D E A D

Originally by Morten Lauridsen (1994, SATB a cappella) Tuning used here D A D E A D (a custom tuning built to ring the piece's own added-2nd color open) Key idea a modern choral standard built on Renaissance fauxbourdon, refretted with its signature color already in the open strings

This is a cappella choir music, set to a plucked custom tuning — no guitar tuning to be faithful to at all. This one was built specifically for the piece: D A D E A D swaps the G in DADGAD for an E, so the open strings themselves already ring the major 2nd against the tonic D — the exact added-tone color Lauridsen leans on throughout the piece.

Widely considered one of the most beloved and most-performed choral works of the last fifty years, O Magnum Mysterium builds its harmony from Renaissance fauxbourdon — chords in first inversion, moving in parallel, giving the piece its signature "floating" quality — layered with simple I–IV–V harmony colored by added 2nds. It's a rare case of a genuinely modern piece built almost entirely from centuries-old technique.

D/F⁠#⁠→ G→ A→ Dadd9

This is the piece's real harmonic language — the opening's confirmed first-inversion D major, the primary I–IV–V chords the piece is built from, and the added-2nd color that recurs throughout — not a bar-by-bar transcription. The piece builds to genuine tone clusters at its climax that don't reduce to six-string chords, so this page stops short of that.

The opening's floating first-inversion D, plus the primary harmony and its signature added-2nd color, voiced in D A D E A D.

Remix with Open—Shape

The climax · measures 40–46

Eight-part clusters, built over one pedal tone

The texture builds from a single line to eight real vocal parts by measure 46, all stacked over a sustained D pedal — the soprano carries a melody modeled on medieval discantus while the tension piles up underneath. The actual eight-part cluster at the peak doesn't reduce to a six-string chord, so instead of guessing at it, here's the pedal it's built on, opening out one added tone at a time the way the real texture thickens.

D5→ Dsus4→ Dadd9→ D

The D pedal the climax is built over, opening out the way the real texture does.

Remix with Open—Shape

Every chord verified against the app's own voicing engine in the real D A D E A D tuning, including the true F⁠#⁠ bass note under the opening's first-inversion D.