Can you think of a few ways to use trees? Of course, first and most importantly they supply our planet with oxygen, apart from that we use them to make furniture, create ships, cover our floors and heat up our houses if there's a fire place. And, of course, trees are absolutely irreplaceable for any ecosystem including even deserts! However, these guys have found a way to use trees in order to create... music! And this music is mind-blwoing!