Longtime Epiphone fan Paul McCartney welcomed the Kronos Quartet to his performance at Outside Lands in Golden Gate Park in San Francisco over the weekend.  As a special treat, the Kronos Quartet arrived with Beatles producer George Martin's original string arrangement in hand to help perform McCartney's classic "Yesterday."  Macca also brought out his vintage Epiphone Texan (complete with Indy 500 sticker) for the performance which he used on the original recording in 1965.  Check it out below.  Go here to read more about the historic Epiphone Texan acoustic guitar and look for our exclusive interview with McCartney's long time bandmate and Jack Casady bass devotee Brian Ray in September.