A few years ago, having snagged a copy of the Liber Usualis (Paroissien Romain) off eBay, I found a leaflet inserted in its pages with notation for "No. 19 : Messe de Sainte Hildegarde". The Kyrie of this Mass is attributed to St. Hildegard, while the rest is anonymous adaptations of melodies she composed for other texts. You may find a transcription of this Mass in the Kyriale section of the Sacred Music page here.
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