Jeremy Green started playing viola in 5th grade, and a few years later began posting incredible video covers of songs on YouTube. He writes on his website that he's interested in advocating for the viola, which often gets overshadowed by the higher- and faster-playing violin. Check out his covers of Sia's "Chandelier," Major Lazer's (feat. Justin Bieber & MØ) "Cold Water," or Drake's "Hotling Bling."