Lake Street Dive's sidewalk performance of "I Want You Back" has garnered over a half-million views on Youtube, with one commenter dubbing the sidewalk where they played, "the luckiest sidewalk in Boston." They will be starting a four night stint at the Lizard Lounge on January 9th, followed by a nation-wide tour.
If I remember correctly, they played the NHPR studios last year, and rocked it.