Adam -
My own taste in blues goes way back beyond Etta James: Bessie Smith etc. were the ones we used to listen to as kids - there was a quite live interest in 'traditional' New Orleans music in the certain parts of the UK, but mostly not. None of us had much money to spend on records, of course, but that didn't stop us trawling the record shops and digging out the little jazz that they carried. Live jazz was also a bit of a vigorous cult - Humph, Chris Barber, many of those guys came up to Scotland and played, as did Louis Armstrong with his Allstars, but that was fairly far away from the Hot 5 and Hot 7 we used to crave.
Blues singers/players like Muddy, Howlin' Wolf and similar were later iterations of the genre - great, too, but more given to being soloists/individualists than bigger band singers. Seems that they were the group that caught the general interest in the UK more tightly than did the jazz blues singers, if you see what I mean.
Anyway, they were all pretty good to listen to and I am often left wondering how the survivors must feel, really feel, about the current styles that get called blues. But as with snaps, everything improves without getting any better. Oh, the recordings are better made.
Rob C