For every second of screen time in a modern animated film, __________

Organum was built by layering melodic lines above

a. existing plainchant melodies. b. secular love songs. c. existing polyphonic works. d. all of the above.

Robert Campin's Merode Altarpiece shows this in the center panel:

a. a crucifixion b. a baptism c. an Annunciation d. an Assumption