REVIEW: Pentatonix's voices, original songs at Allentown Fair show what a cappella should be

Despite all the talent behind it, a cappella music still is a novelty to most listeners. It’s biggest names, Straight No Chaser, and it biggest forums — the “Pitch Perfect” movies — have made the style popular by using it to put unusual spins on hit songs. But there was a time when a cappella stood…
Source: Music