Hmm, interesting. A while back I was writing a piece of software to syllabify Latin and Spanish. The rules I used for Latin were (from Collins, "A Primer on Ecclesiastical Latin"):
* Divisions occur when:
* 1. After open vowels (those not followed by a consonant) (e.g., "pi-us" and "De-us"
* 2. After vowels followed by a single consonant (e.g., "vi-ta" and "ho-ra"
* 3. After the first consonant when two or more consonants follow a vowel
* (e.g., "mis-sa", "minis-ter", and "san-ctus".
*
* Exceptions:
* 1. In compound words the consonants stay together (e.g., "de-scribo").
* 2. A mute consonant (b, c, d, g, p, t) or f followed by a liquid consonant (l, r)
* go with the succeeding vowel: "la-crima", "pa-tris"
These rules seem to apply to the second style you reference (except for omnibus...). I'm not sure where the rules might come from to explain the first examples though...?
It's my experience that the difference has to do with choral precision (and yes, keeping the vowel open). IOW, it's a choral technique, not more, not less.
Singers deal with this when singing in lots of languages.
Singing a text is basically speaking a text in slow motion with pitches moving up and down. In this slower unfolding of speech, pitch and tone are carried on the vowel, or voiced consonants. The singer has to sing from vowel to vowel (and liquescents on voiced consonants) and move most consonants to the next syllable.
In my experience, you're exactly right, and it IS intentional.
When I've written Latin chants, I usually move the consonants over to the next syllable, as a visual cue that the vowel is to be as long as possible. I describe to the schola that "the vowels make it music, the consonants make it words." Especially with consonants such as R or M or N, it's entirely possible to make those way too long. And "firrrrrrrma" sounds totally different than "fiiiiiiiiiiiirma."
* Unless split because of a compound (rare), the consonant pair "st" goes with the following syllable: as in: "my-sterium" "fe-sto" "pa-stores" "gu-stibus" etc.
A book from 1888 I own says the following on hyphenating Latin (translated from German): The words are divided as follows: If there is a single consonant between two vowels, it belongs to the next syllable, e.g. ma-ter; two consonants between two vowels also belong to the next syllable, if they can begin a latin or greek word or are at least muta cum liquida, e.g. pa-tris, li-bri, si-gnum, scri-ptor, scri-psi, re-ctor, La-tmus, Le-sbos, po-sco, ho-spes, magi-ster, Ara-chne, te-gmen, Da-phne, Pha-tnae, rhy-thmus, else the first belongs to the preceding syllable: men-tes, fal-lo, fal-ce, al-ter, com-ma; three consonants between two vowels belong to the following syllable only if the first is c, p or s, followed by muta cum liquida, e.g. do-ctrina, Ba-ctra, corru-ptrix, sce-ptrum, ca-stra, magi-stri; four consonants between two vowels never belong to the following syllable, but at least the first belongs to the first syllable in every case, e.g. mon-strum, mul-ctrum, ton-strix. If words are composites, they are divided so that, if both components are complete, the syllables belonging to them are also left intact, e.g. abs-condo, dis-quiro, et-iam, obs-curus, red-eo, sed-itio; if both components are merged through the corruption of the first one they are divided as if they were simple [non-compound] words, e.g. de-cennis, po-tes, qua-drangu-lus, ve-neo, ani-madverto, ma-gnanimus, lon-gaevus. If in the process of division a single letter would begin or end the line, e.g. o-mnis, ante-a, the division is left out.
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