The Missa voces musicales (also known as Missa Fa re ut fa sol la) by the Spanish Renaissance composer Melchor Robledo (c. 1510-1586) is a Mass based on an ostinato of the six notes (F D C F G A) (like Stefano Felis' Missa La sol fa mi re ut). While the Gloria and Credo are set in a surprisingly simple and homophonic style, the rest of the parts (Kyrie, Sanctus and Agnus Dei) are beautifully composed, specially the Agnus Dei, which is scored for seven voices, including a canon in two voices with the ostinato melody in long values. This is a sort of urtext edition, as it has been prepared by carefully comparing three incomplete sources of the Mass, two in Spain (Tarazona and Silos) and one in Italy (Vatican Library).
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