You’d need a score capable of representing the different note values used in all the music from Merbecke’s Booke of Common Praier Noted. Equalist renderings of these works are serious debasements of what the composer wrote.
I was under the impression that Merbecke's note values were merely a guide to good speech rhythm, something which 400 years and a plainchant revival later is better represented by square notes.
I have made good use of the Tozer transcriptions of du Mont, so if something similar for Merbecke exists, I'd be glad to see it.
Several accurate, attractive, highly readable semi-facsimile editions were published in the nineteenth century. Unfortunately, all the color scans of these I’ve seen online use originals with very discolored paper. I imagine that someone good with image editing software could overcome this.
Merbecke could have used all-square-note notation had he wanted, but went to the trouble carefully to explain his use of measured notes.
Tangent: I do wish that English-speaking bishops' conferences would permit the Sung use of traditional English texts (thee, thy, thou), especially considering the Ordinariate Use, in the Novus Ordo. Provided that the texts were accurate (the BCP "Sanctus" with the text taken from the Te Deum rather than the Latin Sanctus could be a problem), it would be nice to be able to use parts of Stanford and Wood, to say nothing of Merbecke, from time to time: as they were written, rather than adapted to ICEL2010. Here endeth the tangent.
I was today years old when I learned that Merbecke wrote a second setting of the Sanctus for use at a requiem Mass (with a text that differs slightly from the text of the Sanctus found in the communion rite, and is closer to our current English translation). He also wrote a requiem Kyrie and Agnus Dei. I wonder if anyone ever sings these?
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