MIT's co-ed acapella group Resonance delivered a kick ass performance of Justin Bieber's debut single "One time". It may take you a minute to realize the person singing is not Justin Bieber, although you're hard pressed to tell.
This was so tight. The vocal arrangements were as sick as a dawg. The intro and outro did it for me. Awesome! I can't front: I do like "One time". But Resonance just smacked Justin Bieber's version upside the head.