The sounds of the crystals were created by the Balinese Gamelan.
The soundtrack for Evensong was written by director Malibu Taetz, and features unusual Renaissance instruments like crumhorns, the archlute, and the Serpent. An arrangement for classical orchestra was performed by the KLK Symphony Orchestra and Lviv Chamber Choir in the Lviv Organ Hall in Ukraine in 2024.
The floating crystals in the film were accomplished practically, using a blend of puppetry and stop-motion animation.