https://www.youtube.com/watch?v=B3T8V-IM4Xk
Canto Gregoriano Católico-Benedictine Monks of Santo Domingo de Silos
I used to have that cd... and once I heard celestial singing at night. I followed the sound outside to my driveway, and it was my car cd player, mysteriously playing the music— with no keys in it.
ThankQ for reminding me.