To learn more, here is a listening list:

Texas: Henry Thomas (Fishing Blues), Lemon Jefferson (Bad Luck Blues), Blind Willie Johnson (Motherless Children), Leadbelly (Pigmeat), Lightnin' Hopkins (Katie May), Mance Lipscomb (Captain Captain), Lil' Son Jackson (Homeless Blues)

New Orleans: Bo Carter (Old Devil), Skip James (Hard Time Killin' Floor Blues), Toomy Mclennan (Brown Skin Girl), Arthur Big Boy Crudup ( Death Valley Blues)

Delta: Charlie Patton (Moon Goin' Down), Willie Brown (M&O Blues) - there are several Willie Browns, listen to them all - Son House (The Pony Blues), Robert Johnson (etire catalog), John Hurt (Soike Driver Blues, Candyman Blues, etc.), Bukka White (Fixin' to Die)

Memphis: Frank Stokes ('Tain't Nobody's Business), Furry Lewis (Billy Lyons & Stacker Lee), Robert Wilkins (Tha't No Way to Get Along), Sleepy John Estes (Stack O' Dollars)

Georgia: Barbecue Bob (Barbecue Blues),Blind Willie McTell(Statesboro Blues)
North Carolina: Blind Boy Fuller (Bye Bye Baby Blues), Rev Gary Davis (Candyman, Hesitation Blues)

St. Louis: Lonnie Johnson (Careless Love), Hi Henry Brown (Titanic Blues), Henry Townsend (Poor Man Blues)

Chicago: Big Bill Broonzy (I Can't Be Satisfied, Long Tall Mama), Tampa Red (You Got to Love Her With a Feeling), Sonny Boy Williamson (Bad Luck Blues), Kokomo Arnold (Mean Old Twister), Muddy Waters (Hoochie Coochie), John Lee Hooker (Black Snake)

This list is by no means complete, but it will point you in a direction. Lot's of good vidoes of many of these guys are avalaible from Stefan Grossman Guitar Workshop, Sparta, NJ.

Enjoy

DWDitty