In the Agnus Dei , a (≈ 44 BPM) underlies a polyrhythmic overlay of 3:5 and 4:7 ratios, creating a “temporal vortex” that evokes the pleading nature of the text.

(The piano melody evolves, incorporating more dissonant harmonies and unexpected rhythmic changes)

The piano preparation is modest—four brass bolts placed on strings D2–G2, felt strips on the middle register, and a rubber wedge on the low A. The preparation is reversible, allowing the instrument to be restored for subsequent concerts.

For a performer like Melody Marks, who has done everything from hardcore gonzo to mainstream parody, working with Missa X offers a chance to flex "acting muscles" that other productions ignore.