A modern-day traveler or musician discovers a mysterious rhythm that bridges the gap between a high-tech city and an ancient cathedral. Spiritual Practice
This refers to or Apophatic meditation —the Eastern Orthodox tradition of "stillness." It involves the repetitive "Jesus Prayer" and the pursuit of the "uncreated light" through silent, inner contemplation. Byzantine Meditation
Which of these fits the story you have in mind? Or were you looking for a of all three? A modern-day traveler or musician discovers a mysterious