When Jimi Hendrix transfixed the crowds of Woodstock with his gripping version of ""The Star Spangled Banner,"" he was building on a foundation reaching back, in part, to the revolutionary guitar playing of Howlin' Wolf and the other great Chicago bluesmen, and to the Delta blues traditionbefore him. But in its unforgettable introduction, followed by his unaccompanied ""talking"" guitar passage and inserted calls and responses at key points in the musical narrative, Hendrix's performance of the national anthem also hearkened back to a tradition even older than the blues, a traditionrooted in