This is a cover a Sia's "Chandelier" by the A Capella group "Twisted Measure." They are from Elon University (where I studied as an undergraduate before I went to law school).
Just as a reference for those of you who don't remember the original, this was it.
[video=youtube;2vjPBrBU-TM]https://www.youtube.com/watch?v=2vjPBrBU-TM[/video]
Pretty awesome arrangement and cover.