Choral Alleluya V. Nativitas gloriose virginis is a three-part organum, which is attributed to the medieval French composer Perotinus (fl c.1200), who is also known as Pérotin. Written for three male voices, it contains many common aspects of organa composition, including particularly the frequent and interweaving juxtaposition of intervalic consonance with extreme discord. Following the tradition of tropes and sequences in the 10th and 11th centuries, organa were composed for feast days. They were used in both the Offices (small services held throughout the day) and the Ordinary of the Mass (The part of the mass that could use changeable texts). Alleluya Nativitas forms the Alleluia from the Mass of the Nativity of the Blessed Virgin Mary, which is celebrated on September 8. As such, it consists of an the sung word "Alleluia" followed by three verses (the first line of which is "Nativitas gloriose virginis")

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