The recently discovered fragment Vienna 922 is really puzzling me. Folio 1 is cut at the top so only four staves remain. 1r has the end of a tenor part (probably) and the beginning of a Ct(?) of a Gloria, up to "Domine deus rex celestis". But 1v has the end of a cantus Credo (text from "qui locutus"; music from Confiteor to Amen) and the beginning of the Tenor of the Credo. So where does the Gloria continue to? And where was the beginning of the Credo? We're missing 283 syllables before "Qui locutus". From analogy from the Gloria Qui sonitu melodie on 2v, which has 155 notes on the 5 surviving staves and is missing 122 notes, we can surmise that it's a 9-staff manuscript with about 31 notes per staff. Even if the opening of the credo were perfectly homophonic, we'd need 283/31 = 9 staves + 5 = a 14 staff manuscript to fit this Credo on one page. The MS is not a rotulus, since what survives is a bifolio. So, how does it work? We know from Warsaw 378 (and Prague 9?) that sometimes these central european sources skip pages and have discontinuous settings, but this seems ridiculous!
(Reposting here to be able to be linked to from DIAMM. Transcriptions of all pieces in 922 on request)
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It looks like all the ÖNB music fragments are at http://www.cantusplanus.at/. I too have to update my links.
I had a catalogue description and images here: http://www.oeaw.ac.at/kmf/cvp/fragmentphp/fragmente/signaturGET.php..., but this link now seems broken. Does anyone know where it has gone?
Ct of the Gloria may have continued onto bottom of the lost facing verso, if the complete Cantus and Tenor pair filled the top of the verso and recto pair respectively. One way of making sense of the Credo would be if the Cantus started on the lost facing recto, but this would suggest a very haphazard copying process. Whether the Credo contained all the articles of faith is also a question that might be asked. Another possibility is double texting of some pairs of articles of the Creed. One might entertain the possibility of a telescoped Credo like found in sources like Munich 14274.