When did Gregorian chant first develop?
Gregorian chant
Beside the length of the syllables (measured in tenths of seconds), each text syllable was evaluated in terms of its position within the word to which it belongs, defining such variables as "the syllable has or has not the main accent", "the syllable is or is not at the end of a word", etc., and in terms of the particular sounds produced (for instance, the syllable contains the vowel "i"). The various neume elements were evaluated by attaching different duration values to them, both in terms of semiological propositions (nuanced durations according to the manner of neume writing in Chris Hakkennes’ Graduale Lagal[60]), and in terms of fixed duration values that were based on mensuralistic notions, however with ratios between short and long notes ranging from 1: 1, via 1: 1.2, 1: 1.4, etc. to 1: 3. To distinguish short and long notes, tables were consulted that were established by Van Kampen in an unpublished comparative study regarding the neume notations according to St Gallen and Laon codices. With some exceptions, these tables confirm the short vs. long distinctions in Cardine’s 'Semiologie Gregorienne'.