Dufay's Nuper rosarum flores repeats the fixed melody on 6,4,2,and 3 units per breve to

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Dufay designed the structural proportions of his motet according to the architectural design of the Florence Cathedral, which, like the motet, was symbolically dedicated to the Virgin Mary. The song has 6, 4, 2 and 3 beats, which correspond to the numerical ratios of the cathedral's walls, the width to the height being 6:4 and the chapel's width to 2/3 of the width of the chapel as a whole being 3:2.

Dufay's Nuper Rosarum Flores Repeats the Fixed Melody on 6,4,2,and