William "Billy" Cox (born October 18, 1941) is an American bassist, best known for performing with Jimi Hendrix. Cox is the only surviving member of Jimi Hendrix's three main bands, including the original Experience lineup (which did not include Cox); he was in the Band of Gypsys and afterwards the Cry Of Love (a.k.a Jimi Hendrix New Experience) trio. Cox was also in the short-lived Hendrix band Gypsy Sun and Rainbows (there are other surviving members from this group) which played Woodstock, prior to the Band of Gypsys formation. Cox continues to perform dates with the Band of Gypsys Experience and the Experience Hendrix Tour.