He Began Singing “Hallelujah”. But When THEY Joined In? I’m Out Of BREATH!

Pentatonix is one of the most popular a cappella vocal groups out there. They rose to fame after winning the third season of The Sing Off on NBC. With 11 million subscribers on YouTube alone, they’ve proved that they are not going anywhere. People are hooked on their incredible work, which is quite normal when they regularly release numbers like these!