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PROVIDENCE — Their mascot is "the unicorn of friendship," their music was described as  “poetic” and “evocative of feeling" by National Public Radio, and they'll be playing Upstairs at the Columbus Theatre on Sunday. 

Darlingside, a Boston-based band whose signature superpower harmonies have drawn frequent comparisons to groups like Crosby, Stills & Nash, Simon & Garfunkel and The Byrds, plan to share music from their new album "Extralife."

While the band's critically acclaimed 2015 release "Birds Say," was "steeped in nostalgia and the conviction of youth," according to a statement, "'Extralife' grapples with dystopian realities and uncertain futures."

Darlingside’s quartet consists of bassist Dave Senft, guitarist/banjoist Don Mitchell, violinist/mandolinist Auyon Mukharji, and cellist/guitarist Harris Paseltiner.  "We put our four heads together and created this collective consciousness about bits and pieces from our past and how we saw the world based upon reminiscences,” said Paseltiner about the process of putting the new album together.