Mat888 is spot on with the Albert Collins, Robert Cray and Johnny Copeland album - Showdown. The Iceman was an incredible blues guitarist.
There is also a box set album by Eric Clapton called 'Crossroads 2: Live in the Seventies', its just brilliant and, in my humble opinion, is a showcase of Slowhand at his best (and really shows why he got his nick name). For some grittier stuff check out From the Cradle - some great work.
Any of the older B.B. King, John Lee Hooker, or Albert King is also going to be awesome.
If you haven't already got it, you absolutely have to get the Beano, the real title is "John Mayall and the Bluesbreakers featuring Eric Clapton". (Clapton is on the front cover reading a copy of the comic book 'The Beano' - hence the name). The other one to get is John Mayall's Bluesbreakers - A Hard Road. This was the first album released after Clapton left to form Cream. The replacement guitarist was Peter Green, who is one of the greatest blues guitarists of all time. After A Hard Road, he formed Fleetwood Mac with Mick Feetwood and John McVie - a box set of 'Peter Green's Fleetwood Mac' was released called "The Complete Blue Horizon Sessions", which has some of Green's greatest work, including "Black Magic Woman". There are also some Bootlegs floating around. B.B. King once said of Peter Green 'he was the only one who could give me cold sweats.'
The British Blues Explosion produced some really cool stuff, and there are strong links between guitarists like Jeff Beck, Clapton, Peter Green, Jimmy Page, and Gary Moore ("Still got the Blues" was pretty cool too, although probably not as bluesy as it could be). Anything by the Yardbirds is also going to be pretty good (the guitarists were Clapton, Beck and Page)
For something completely different, you could try to see if you can find an album called 'The Starfleet Project' by Brian May and Friends. This is a mini-album wih Eddie Van Halen and is interesting because both May and Van Halen produce probably the two most recognisable sounds, and they are rock guitarists. The songs 'Let Me Out' and 'Bluesbreaker' are basically May and Van Halen jamming, it was a very interesting exercise.
Okay.....time to take a deep breath!! Wow, I had forgotten how cool some of the blues stuff really is. Sorry to say I don't know a great deal about Jazz.
Hope this helps - let us know what you end up with.
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