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 ...

There is no accompaniment or secondary melody. 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 ...