The pair played A Great Big World and Christina Aguilera's 'Say Something'.
All Time Low's Alex Gaskarth and PVRIS vocalist Lynn Gunn covered the track in a special session recently.
Watch their performance in the clip below.
Wasn't that lovely?
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Well this is lovely.
Twin Atlantic? The Gaslight Anthem? PVRIS? This will do nicely.
Settle in for this one.
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