You could see this tUnE-yArDs performance on Fallon with Questlove and Black Thought coming from a year-and-a-half away, when @Questo tweeted “omfg!!!!! watching tune-yards on stage now. this is some of the GREATEST ish I’ve seen in a minute!!!!” from the Bowery show the bands played together in November of ’09. Last night, Merrill Garbus did w h o k i l l’s propulsive funk show-stopper “Gangsta” with some added backbeat muscle compliments of the Roots’ bandleader and style/verse compliments of the Roots’ rapper. Hat tip to the Fallon music staff for continued good booking but also for thoughtful camera angles on Merrill’s feet working those loop pedals, which probably helped avoid confusion in some households, and sell loop pedals in others.