The original melody is likely a variant of a medieval Gregorian chant. The text was written in 1328 by Henrich Suso, a priest who claimed to have a vision in which angels danced in celebration of ...

Gregorian: Pure Chants in Concert is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet ...

The term monophonic can be used for single lines - this could be solo, unison or octave doubling. Gregorian chant is monophonic - all the monks sing the same melody together.