Watch Haim and John Mayer cover 'Mustang Sally'.

Watch Haim and John Mayer cover 'Mustang Sally'.

At Ron Perry's birthday party (the CEO of Columbia Records) last night, Haim joined forces with John Mayer to perform a cover of 'Mustang Sally'.

Watch some video clips of the performance below...

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COUP DE MAIN’S TRUE JAMS PLAYLIST

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