Preludes, Livre I. No. 10: La Cathedrale Engloutie (The Engulfed Cathedral or The Sunken Cathedral): Full Orchestra, Condensed Score/Piano Conductor

Mouton's orchestration transforms one of Debussy's most evocative piano images into an immersive ensemble experience without sacrificing the composer's harmonic subtlety. The condensed score format makes this accessible for conductors preparing an orchestra premiere of impressionistic literature, offering orchestral musicians direct engagement with Debussy's sound world rather than through reduction or transcription alone.

Water-like and mysterious, the cathedral's emergence unfolds through layers of shimmering orchestral color. Bells seem to ring from underwater, gradually rising toward a luminous climax before fading back into silence and shadow.

Orchestra directors seeking impressionistic repertoire that challenges musicians beyond standard classical and romantic literature while remaining accessible for high school and early college ensembles. This arrangement works well for conductors who want to program Debussy without relying solely on transcriptions, offering a full orchestral sound grounded in the composer's original harmonic language.

• Balance the bell-like sonorities across the entire ensemble by rehearsing the entrance of each instrumental choir separately; the cathedral's pealing emerges gradually, and clarity matters more than volume.
• Shape the central climax with long-range dynamic planning across several minutes of music, resisting the urge to peak too early in the cathedral's rise.
• Listen carefully to the timpani part as an anchor for harmonic movement; it guides the ensemble through passages where traditional functional harmony is absent.
• Conduct with gestures that encourage floating, sustained tone quality rather than precise rhythmic articulation, especially in passages marked to suggest the cathedral emerging from beneath water.

Pair this with other impressionistic works for an entire concert exploring color and form beyond traditional structures, or place it as a contrasting centerpiece between classical and contemporary pieces to highlight the orchestra's expressive range. The piece's moderate length and evocative subject matter make it compelling as a concert opener or a transition between program sections.

• Balancing multiple instrumental choirs in a texture where no single voice dominates
• Conducting music without functional harmonic anchors or traditional cadences
• Listening for timbral shifts as the primary structural marker rather than melody or harmony
• Shaping sustained passages that imply motion without relying on rhythmic propulsion
• Reading a condensed score and translating it into full orchestral sound