Unfortunately, I can't see a source of this book in the UK, and Amazon.com says it can't ship to me! (I hope that means they don't have distribution rights, not that my location is blacklisted/quarantined)But most astonishing of all is that Jan van Biezen's rhythmic discoveries now make Gregorian chant amazingly easy to sing. Theoretically, Antiphons could be learned by a congregation without ever looking at a page, and choirs could sing melismatic Graduals in unison without conducting. I shiver with excitement!
[review by 'coemgenus' of Rhythm, Meter and Tempo in Gregorian Chant]
Jan van Biezen's rhythmic discoveries now make Gregorian chant amazingly easy to sing
The latter. One of the earlier mensuralists surely would have noted it if the former were the case. Blackley writes of the "ordinarily binary nature" of chant but, following Vollaerts and Murray, admits short-long and long-short-long exceptions. (See https://www.scholaantiqua.net/pdfs/RhythmBeforeMid-Twelfth.pdf.)So, does the written evidence for mensural rhythm, in the period when this music was sung this way, also provide evidence of the steady tactus? Or perhaps that's read into this music from Arabic or Byzantine performance practice?
I would say it's his interpretation of ornamental notes. The summary in English (http://www.janvanbiezen.nl/gregorian.html) presents the substance of his theories.There is very little difference, ultimately, between them. What is it that sets van Biezen's work apart?
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