For a split second, while singing their rendition of the Jay Sean hit “Down,” the a cappella sextet of Nota went speechless for the first time since appearing on The Sing-Off.
That's because Jay Sean himself snuck up behind them and joined them onstage Monday after they won the musical competition.
“When they called me up and said if Nota win, we would love for you to come out, surprise them and sing your song with them, I said, ‘Oh my God, of course I will,” Jay Sean tells PEOPLE. “But one thing I knew, and I told them, was, ‘Guys, you do realize there’s actually no backing music. They are the music.' So if they get surprised, which they will be, they’ll stop singing! There will just be silence! Luckily, they’re all such pros and they just kicked back in and we had fun.”
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