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GREENFIELD, MA - JULY 11: Big Nazo (space aliens) sit in with Rubblebucket during their performance at the Green River Festival 2015 at Greenfield Community College on July 11, 2015 in Greenfield, Massachusetts. (Photo by Douglas Mason/Getty Images)

GREENFIELD, MA - JULY 11:  Big Nazo (space aliens) sit in with Rubblebucket during their performance at the Green River Festival 2015 at Greenfield Community College on July 11, 2015 in Greenfield, Massachusetts.  (Photo by Douglas Mason/Getty Images)