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Published September 28, 2015 at 352 × 500 in Kelly Clarkson at Aaron’s Amphitheatre

Pentatonix’s Mitch Grassi performs on stage at Aaron’s Amphitheatre at Lakewood in Atlanta on Thursday, September 10, 2015. Pentatonix opened for Kelly Clarkson.

September 10, 2015 Atlanta – Pentatonix’s Mitch Grassi performs on stage at Aaron’s Amphitheatre at Lakewood in Atlanta on Thursday, September 10, 2015. Pentatonix opened for Kelly Clarkson. JONATHAN PHILLIPS / SPECIAL