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Hello! I'm looking for sources of the Sequence Flos de spina procreatur (ah09097); CANTUS lists only one source( from the 13th century ms. GB-Cu add710; c.1250-75?).
This text is used in a two-voice conductus in the Notre Dame sources, of which Pluteus 29.1 is probably the earliest ... c.1240s.
Does anyone know of any earlier plainchant sources with this sequence? Many thanks! -- Alan