Dot Porter, Curator, Digital Research Services at the University of Pennsylvania Library, offers a video orientation to Penn Library’s Ms. Oversize 33, choir psalter gatherings from the Catholic Church. This manuscript was written in Spain in the 16th century, in Latin, and it is a section (5 gatherings) from the middle of a choir psalter containing a number of psalms (part of 67 and all of 71, 74-75, 80, 83-86, 88, 90-91, 94-98, and 102-103) in order for liturgical use.
You can see the full online facsimile of this work in Penn in Hand and you can download all of the images and metadata at OPenn.
The Schoenberg Institute for Manuscript Studies 