Pitch Perfect 2 centers on an a cappella singing group.
== Emulating instruments ==In addition to singing words, some a cappella singers also emulate instrumentation by reproducing instrumental sounds with their vocal cords and mouth, often pitched using specialised pitch pipes
Since "a cappella" singing brought a new polyphony (more than one note at a time) with instrumental accompaniment, it is not surprising that Protestant reformers who opposed the instruments (such as Calvin and Zwingli) also opposed the polyphony

