Spirit "Taurus"= Stairway To Heaven
Memphis Minnie "When The Leevee Breaks"
Jake Holmes "Dazed And Confused"
Bert Jansch via Traditional "Blackwaterside"=Black Mountain Side
Moby Grape "Never"= Since I've Been Loving You
Small Faces via Willie Dixon "You Need Loving"= Whole Lotta Love
Fear Itself via Blind Willie Johnson "In My Time of Dying" with cough
Also
It's a Beautiful Day "Bombay Calling"=Deep Purple's "Child In Time"
Beautiful Day did steal a riff from Purple later, but I haven't found it.