Watch Jack Antonoff perform Bleachers songs at a The 1975 show.

Following Phoebe Bridgers' surprise appearance last night, Jack Antonoff popped up as a special guest at tonight's The 1975 show in San Francisco - performing an acoustic medley of Bleachers songs, 'All My Heroes' and 'Rollercoaster', accompanied only by a saxophonist.

Watch some fan-filmed videos of the performance below...

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