Final answer:
The Gloria from the Pope Marcellus Mass by Palestrina is a polyphonic choral composition.
Step-by-step explanation:
The Gloria from the Pope Marcellus Mass by Palestrina is best described as a polyphonic choral composition. Polyphony is a notable characteristic of Renaissance music, where multiple melodic lines are sung or played simultaneously. In this particular piece, multiple voices interweave to create a rich and textured choral sound.