Emil and Dariel perform 'Satisfaction' on America's Got Talent 2014 (VIDEO)

Emil and Dariel performed 'Satisfaction' on America's Got Talent 9 Quarter Finals #4 on Tuesday, August 19, 2014.

This was the biggest surprise of the night for me. They perform a very lively rendition of "Satisfaction" by The Rolling Stones, and it's...kind of awesome, actually. I was genuinely surprised at how well this worked, since I wouldn't have thought a cello-infused version of that song would work. But even better than how it sounded was the stage presence these guys have. They weren't just playing the song, they were ROCKING OUT!

Howie loved the performance, saying that while he never would have expected a rendition of "Satisfaction" quite like that, Emil and Dariel prove that "there's always room for cello." (A cute play on the old Jell-O slogan) Howard dug the act and thinks they should bring their grandfather onstage for their next performance. Heidi feels they should open up a brand new category of music just for these guys. Mel B thought it was "off the chain" and calls them exciting, passionate, edgy, current, and fun. That's a lot of superlatives. And they deserve'em.

But what do you think of Emil and Dariel?

Watch the performance video here: