This is a remix of Kokiriko Bushi, Japan's oldest song, done by Far East Recording's Omodaka. Watch and listen to the original Kokiriko Bushi here. According to their website, Omodaka is the name of the project "developed through a trial and error process of mutational fusion of music and motion graphics. It will knock over your existing image toward a music video by a beautiful trajectory." You can listen to mp3s of their songs here.