Buddy Guy and Ray Charles.

And Mary Had a Little Lamb is a 12 bar song. So is that BB King song.

Also: Junior Wells, Earl Hooker, Magic Sam, Ry Cooder, Captain Beefheart and the Magic Band, and Jimmy Rogers are worth checking out.
Key to the Highway is an 8 bar blues I think.
Ticking away the moments that make up a dull day
You fritter and waste the hours in an offhand way
Kicking around on a piece of ground in your home town
Waiting for someone or something to show you the way
Quote by Dimebag22
Key to the Highway is an 8 bar blues I think.

I think Sittin of the World is a 9 bar song.
Quote by Dale_kerigan
nah 8 bar

Wiki says nine, and I counted them out. It's nine.
check out some of the grateful dead's blues tunes with Pigpen:

Good Lovin'
Hard To Handle
In The Midnight Hour

I'm talking about live versions by the way.
If you want some funky blues, try Mos Def's New Danger album. Blue Black Jack especially.