This work investigates the structural and harmonic composition of the Kyrie movement from the mass attributed to the composer known as Le Roy. The text provides a technical analysis of the polyphonic arrangement intended for SATB unaccompanied vocal performance. It serves as a scholarly examination of the liturgical music traditions prevalent during the period of the composer's activity. The document functions as a performance score and historical record of the specific musical setting.

Musicologists and choral directors identify this as a significant example of Renaissance polyphony. Experts highlight the technical precision required for the unaccompanied vocal parts.