Found this by way of The Backbeats (superb co-ed acapella group from The Sing Off Season 2). I love the cello in general, especially since its sound is closely related (and its literature, borrowed) by trombonists :p
This guy is GOOD. Check out the video!
The KO Hip-Hop Cello-Beatbox Experience: Julie-O (by kolusola)
Source: youtube.com
The place where 
