What you see now is just an outline, I will add more artists and additional details about each.
Rev Gary Davis Gary Davis was a powerful vocalist and a masterful guitar player. He wrote Death Don't Have No Mercy and recorded a version of Samson and Delilah. He is probably the Dead's source for both these songs and is rumored to have given Bob Weir guitar lessons.
Blind Willie Johnson
Willie Johnson is credited with one of the earliest recordings of Samson and Delilah, entitled If I Had My Way. He also recorded Nobody's Fault But Mine as well as Keep Your Lamps Trimmed And Burning.
Lightnin' Hopkins wrote Katie Mae and Ain't It Crazy, sometimes refered to as The Rub, both of which were sung by Pigpen in the early days.
Chester Burnett, aka Howlin' Wolf, made famous many of the classic blues tunes penned by Willie Dixon. He recorded Little Red Rooster, Smokestack Lightning, Spoonful and Wang Dang Doodle.
Willie Dixon is the author of Little Red Rooster, The Same Thing, Spoonful, Wang Dang Doodle and I Just Want To Make Love To You. Willie also co-wrote Eternity with Bob Weir.
The Stanley Brothers
Ralph and Carter Stanley wrote and recorded many songs performed by Garcia, both with the Dead and solo. Included are (Cold) Jordan, White Dove, Pig In A Pin, Little Glass Of Wine and The Fields Have Turned Brown.