I I7 IV iv
I7 V I7 IV I7 V
I saw the above chord structure listed for sitting on top of the world at this site:
http://en.wikipedia.org/wiki/Howlin_Wolf The last four chords are given for a half-bar each.
This is described as an 8 bar progression, and I know what you mean about this song having a turnaround in the 9th bar. Anyone else?
I am not familiar with that particular version; I play (on a guitar) the Big Bill Broonzy's version, which is quite similar to the original (?) song recorded by Mississippi Sheiks in 1930. It is an 8 bar blues and goes like this: E E A7 A7 E B7 E7/B7 E (here BBB plays another bar of E). Hope this helps. cheers