Notes that begin a phrase before a downbeat are known as pick-up notes or a/an


A. anacrusis.
B. duck walk.
C. shuffle groove.
D. call and response.

The function of Philip Glass's "Knee Plays" within the opera was to


A. join the four acts through a constant motif.
B. introduce a minimalist element into the complex work.
C. offer a playful distraction from the lack of resolution in the plot.
D. divide the vocal lines.