A beautiful motet attributed to the Portuguese composer Pedro de Cristo (c. 1550-1618). The source of Quae est ista, copied by Pedro de Cristo himself, has four voices written down and indicates a beginning and an end of a canon in the Cantus, but omits its interval. However, the only possible option is a canon ad unisono, producing a very similar sound to the famous motet Ave virgo sanctissima by Francisco Guerrero. Could Pedro de Cristo have known and been inspired by the motet of Guerrero?
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