Illuminated leaf from choirbook

Description: Black square notation on 5-line red staves; 5 to 6 alternating lines of music and text, with 1 initial in red (recto) and 1 puzzle initial in red-and-blue (verso) on purple-and-white grounds. Double barlines filled in yellow. Rubric (verso): Ad tertiam missam in die natiuitatis domini. Introitus.
Liturgical book hand
commouebitur parata sedes tua deus ex tunc a seculo tu es.
Puer natus est nobis et filius da[tum]
Verso: Beginning of Introit for the 3rd Mass on the day of the Nativity of the Lord (i.e., Christmas).; Recto: The communion chant, Exulta filia Sion, is for the dawn mass for the Nativity of the Lord (i.e., Christmas).
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Origin: circa 1600
Source: http://dmr.bsu.edu/cdm/ref/collection/IlluminManu/id/158
Collection: Illuminated Manuscripts
Rights: http://rightsstatements.org/vocab/InC/1.0/
Subjects: Illumination of books and manuscripts--Specimens
Illuminated manuscripts
Service books (Music)--Catholic Church--Early works to 1800

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