In his O magnum mysterium, Franz M. Herzog makes the mystery addressed in the text impressively tangible and audible: he combines sustained tones with atmospherically floating successions of chords, differentiates the dynamics in a finely nuanced manner and repeatedly sets rhythmic and melodic accents, whereby he highlights meaningful words in the text. Modern, yet timeless, this profound, striking choral composition is a great enrichment for concert performances and solemn church services alike.