Kyrie Eleison (XI - Orbis factor) | 10th-century Gregorian Chant |

This Kyrie, Orbis factor, whose name comes from the first of its trope verses, ("creator of the world") is one of the more well known pieces of Gregorian chant today, mostly from modern performances of its more recent, 14th-century version (e.g. 90s sensation Enigma, and early music group Ensemble Organum, et al.)
Mindful of the earlier, less ornamented 10th-century version of this melody, I ‪@jasongutekunst‬ perform a simplified form of organum to accurately reflect how an older incarnation of this chant may have sounded.
Drawn from the Solesmes' Graduale Triplex (p. 748) this 10th-century C.E., first mode (D mode) chant, "Kyrie eleison," (translated "Lord have mercy!") from the Kyriale, Ordinarium (XI) is the first 'song' in that sextet of pieces that make up the "ordinary of the mass" [Ordinarium Missae].
Together, the Kyrie eleison and five other chants of the 'ordinary' (Gloria, Credo, Sanctus, Agnus Dei, Ita) are woven together with the 'propers' of the mass (Introit, Gradual, Alleluia/Tract, Sequence, Offertory, Communion) to complete the liturgy of the weekly Mass celebration.
Note: For the eagle-eyed (and owl-eared?) folk out there, the sound for the first verse only, (orbis factor) may appear slightly out of sync with the video. This is because it was only AFTER I'd mostly finished working on this piece, that I realized the first verse was a bit off. So, shuddering at the thought of redoing all of the in-video chant text/notation snippets, I just re-recorded this verse and dubbed over the video's sound for that portion.
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