It seems the OPs focus is on classic blues rather than blues-rock. However, some have responded naming blues-rock artists. For some reason I never warmed up to classical blues like Buddy Guy, though I listen and respect the outstanding musicianship of these artists. So I will error, like others, and maybe even further, in mentioning blues-rock artists that are some of my favs:
Stevie Ray Vaughan
John Mayall
Eric Clapton
Jeff Beck
Walter Trout
… and even though he may be considered more singer-songwriter than blues-rock, Leonard Cohen … who’s music may not have strict blues structure but has many elements that are bluesy.
