Pentatonix Gives Us Their Greatest Pop Vocal Moments of All Time

As an a cappella group, Pentatonix knows how important good vocals are. So when Billboard caught up with the group, we asked for their list of the greatest pop vocal moments of all time. 

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"I would say Whitney Houston's "I Will Always Love You" is up there," Kevin Olusola said. "It's one of the best."

Mariah Carey and Adele also made their exclusive cut. Watch the video above for the rest of their picks. 

Billboard Greatest of All Time