I like many types of music marloyd .
The type blues I listen too is what some would find closer to classic rock , rock & roll , or maybe as far back as rockabilly.
So I define both Jimi Hendrix & BB King as blues musicians.
Some Elvis Presley & Roy Orbison could also be called blues.
It’s been a few years back & I’m not sure I still have it . I recorded 3 or 4 hours from the local PBS station a special on the blues. Mostly covered some of the early blues musicians . I will have to see if I can find it.
As far as what is called Rhythm & Blues I don’t listen to a lot of it . I guess I would define it as disco. However if I think of a Gladis Knight or Aretha Franklin song it plays in my head till I can get it out.I heard those a lot in Disco bars in my hard partying days.
A lot of country music is also blues sang with a different accent . They are refereed to as “Crying in My Beer” songs. What is a song where my wife & my girlfriend left me , my dog bit me, the house burned down & I wrecked my truck & broke my leg. But the Blues.