This is my entry for the Secrets of Organ Playing Contest Week 127.
I'm playing Dialogue sur les Grand Jeux (from 'Messe pour les Paroisses') by François Couperin on the Hauptwerk sample set of Nancy Cathedral.
This organ has a fabulous acoustic with about 7 seconds of reverb (if I'm not mistaken). It means the player has to adjust their articulation and speed to suit otherwise it may become a muddy wash of sound. The beauty of a huge acoustic is a pleasant listening experience for both player and listener—in other words, reverb makes everything better!
Whilst this piece may be in the French classical literature, the organ was designed for French romantic music. However, I still think it pulls it off—let me know what you think in the comments.