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Shawn Mendes - 'Something Big' live on Letterman.

Shawn Mendes - 'Something Big' live on Letterman.

Shawn Mendes appeared on 'The Late Show with David Letterman' this week to perform his new single, 'Something Big', accompanied by a brass backing-band.

Watch the performance below…

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COUP DE MAIN’S TRUE JAMS PLAYLIST

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