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Acoustic or electric blues? The styles are very different.
Either way... if you're looking for the roots of blues and where all of the various styles can trace lineage back... get some Robert Johnson recordings.
Get set to listen to some scratchy mono recordings that will blow your mind if you are willing to listen.
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Solid advice...
In the RJ vein... Listen to some Son House & Charley Patton stuff - some of the old recordings are God-awful, but the playing was (is) groundbreaking. Then take up some Lightning Sam Hopkins.
Following this pattern, check out some of the 60's recordings from John Mayall's Bluesbreakers - starting with early Clapton work, on songs like 'Bernard Jenkins", "Lonely Years" or "Blues City Shakedown", Peter Green's playing on "A Hard Road", or Mick Taylor on "Me And My Woman". When working-class Brits re-discovered blues music, the resulting scene that broke out produced some of the finest guitarists (and music) ever heard - and launched countless legendary bands & solo acts. Clapton, Beck, Page, Green, Richards, Taylor, Danny Kirwan, Rory Gallagher, Ronny Wood, Jimmy McCulloch - there were so many blues/rocks guitar Gods that arose from the British Isles, it boggles the mind.
Edit - someone said Gary Moore...