As SPIN.com's Peter Gaston learned while chatting with the Chicago duo at this year's Lollapalooza festival, throwback hip-hoppers the Cool Kids know how to have a good time and rock a crowd sufficiently. Click below to watch clips of Mikey Rocks and Chuck Inglish at this past weekend's Outside Lands Festival in San Francisco, CA, as they bemoan wearing the same clothes as their manager and tear through spanking new jam "Delivery Man."
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