Carly Rae Jepsen had the crowd singing along right from the start with catchy 'Call Me Maybe'

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One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015

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See the full gallery: One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015