They're billed as "the youngest string quartet ever." The kids began playing in The Joyous String Quartet when they were four years old. Now, fast forward four more years, and they find themselves performing 20 concerts a year around the globe -- in places like South Korea and China, and on the Ellen DeGeneres Show. Above you can watch them perform Summer "Presto" by Vivaldi. Below, they give you a classical version of Katy Perry's "Firework:
And finally Michael Jackson's "Smooth Criminal." In case you're wondering, the students come out of The Joyous Music School in Hicksville, NY.