Italian Manuscript Parchment Leaf from a Choir Book

It is a one-leaf (two-page) handwritten manuscript that was once part of a large 17th century choir book. The music (square notes) and Latin text were sung as part of the liturgy of a Catholic Mass. This music manuscript is made of parchment, which is sheep and goat skin that has been processed and used for writing. It is in good age related conditionand dates back to the seventeenth century