Top of my head:

"Righteous Blues", "Chump Man Blues","Police Dog Blues"- Blind Blake
LP "Reverend Gary Davis 1935-1949" I favor his earlier recordings.
"Hesitation Blues"- Rev. Davis
"99 Year Blues"- Jim Kweskin version.
"Let's Work Together"- Canned Heat Version
"High Water Everywhere", "Green River", "Pony Blues"- Charley Patton
"M&O Blues"- Willie Brown
"How Blue Can You Get"- B.B. King from Live at the Regal
"That's What Love Will Make You Do"- Little Milton