"I always thought of 'Delta Blues Music' as a style." Son House learned slide from Rube Lacy, who had learned slide outside the Yazoo-Mississippi Delta; Robert Johnson learned to play guitar well from Ike Zimmerman, who wasn't from that Delta, and emulated the records of Kokomo Arnold, who wasn't either; Hacksaw Harney in that Delta played the way he did; Crying Sam Collins outside that Delta played the way he did; "Mississippi" Fred McDowell learned to play guitar in Tennessee not knowing anyone would later care whether he ever lived in that Delta; Chicago welcomed Tampa Red and John Lee Williamson to the blues fraternity; etc. because the '20s-'30s blues musicians hadn't got the memo about what Alan Lomax would imagine in the '40s any more than the '20s-'30s blues writers had.