If you can help us in identifying the music and perhaps the edition from which this comes, this would be really helpful. Obviously it’s a fragment, and it was used as a flyleaf in this incunable; however, it is very likely that the music is quite a bit younger than the incunable. Even to a researcher of twentieth-century music, like me, this looks as if this leaf is the seventh part of a piece for two choruses, and this being part of the second choir.The recto leaf (see right) might help even more, as it bears the page number 72 – so this page should have formed part of a much bigger volume of the original edition.
A colleague of mine has suggested that this looks like an Italian print to him…. I should add that I have improved the digital images’ brightness and contrast – so what you see here is not how the original paper looks.
If you can shed any light on this, please either write a comment underneath this post (it will not appear immediately, but will be approved as soon as possible), or email me at cg474 [atsign] cam [dot] ac [dot] uk. Let’s hope that by using crowdsourcing we can help my colleague.