This is a virtuoso cimbalom player!!! Wow! A cimbalom is a kind of eastern-european concert hammered dulcimer. You play it by hitting steel strings with 2 beaters. Wiki knows more, here.
And here is his band:
I absolutely adore this type of music!!! If you want to hear some, just search for cimbalom gypsy mus on, or cimbalom klezmer on Youtube.