Final answer:
Josquin's Ave Maria...virgo serena incorporates an older Gregorian chant.
Step-by-step explanation:
The answer to the question is True.
Josquin's Ave Maria...virgo serena does incorporate an older Gregorian chant. It is a polyphonic choral composition by Josquin des Prez, a Renaissance composer. In this piece, Josquin takes the original Gregorian chant melody and uses it as the basis for his own composition.
This practice of incorporating older melodies into new compositions was common in Renaissance music. It allowed composers to pay homage to the past and demonstrate their skill in transforming existing material.