Blues "must have, top 100" list?

I agree with just about every selection recommended so far (especially Muddy Waters Folksinger), and would add the beautifully mastered and packaged set on John Fahey's Revenant label: "Screamin' and Hollerin' The Blues--The Worlds of Charley Patton." Not only is Patton represented in this 7-CD set, but so are such Delta greats as Son House, Bukka White, Willie Brown and Tommy Johnson. Essential listening.

I will be much poorer after working through all the suggestions.

Thanks to all for the great posts.

I also like the Bluenose's recommendation of Philadelphia Jerry Ricks "Empty Bottle Blues": nice album.

Ivyinvestor, here's a link to the Willie Dixon: The Blues Every Which Way LP:
http://store.acousticsounds.com/browse_detail.cfm?Title_ID=13302
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Ooop's. Forgot Freddie King. I'm goin' down!!

"King of the Delta Blues" by Robert Johnson is generally considered the most influential blues music ever.