In a post on the Surface blog, Bryson Gordon, a director on the Surface team wrote:
Like a lot of Microsoft-ies, I am the resident tech support contact for my extended family. This means that when my in-laws’ old laptop needed some TLC, I took it down to the team at the Microsoft Store, University Village to get it taken care. Outside of getting it running like new, a few of the associates starting talking with pride about one of their own, Jonathan Velasquez, and what he could do with the Surface Music Kit. I left my email address and later that night, after the doors closed, (you’ll notice in the video it is 9:18pm), Jonathan sent me this video. I’ll let it speak for itself.
The Surface Music Kit may launch at the Build conference in early April. Currently Microsoft is having a tough time keeping the Surface, Surface accessories, & Xbox Ones in stock anywhere.
Source: Surface Blog