Pentatonix Adds A Cappella Twist to Ariana Grande’s Problem

The group adds an a cappella twist to the summer jam

WATCH/LISTEN: Pentatonix Performs A Cappella Mash Up Of Daft Punk

From "Get Lucky" to "Digital Love"

By Stacy Lambe

WATCH: Pentatonix Performs The Evolution Of Beyoncé

They do it all with their mouths

By Stacy Lambe