Chainsmokers rock Central Park with 'All We Know'

The duo performed its hit song live for the "GMA" Summer Concert Series.
4:06 | 08/10/18

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Transcript for Chainsmokers rock Central Park with 'All We Know'
So department has. National defense. Please. So we. Okay. Only.

This transcript has been automatically generated and may not be 100% accurate.

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