Watch: Fall Out Boy perform new song 'Expensive Mistakes' live.

Watch: Fall Out Boy perform new song 'Expensive Mistakes' live.

Currently on their M A  N   I    A tour (in support of their forthcoming album of the same name), Fall Out Boy have debuted a new song, 'Expensive Mistakes', road-testing it for delighted American fans.

Watch fan-filmed footage of the new song below...

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