It is highly likely that this codex is the original transcription
of the neumed manuscript in the hand of Guido von Arezzo
commissioned by Abbot Johannes I of Schwanden shortly before 1314.
The calligraphic copies found in the other "Schwanden codices" were
then produced following this source. Evidence of heavy use
indicates that these manuscripts remained in use into the 17th
century, that is, until the liturgical reform of the Council of
Trent. The forms used are from the Alemannic choral dialect, which
is still sung in Einsiedeln today.
