Tipo de gaita: Diatônica
Tom: Bb

I let my computer tab this from a midi version.  I attached a filethat shows score with the tab.

Here's Led Zeppelin's version on YouTube:
http://www.youtube.com/watch?v=Z_Ny9_CrUVY

And here's an interesting version by Robert Plant & the StrangeSensation:
http://www.youtube.com/watch?v=WjGM0hh7Jm8&mode=related&search=

The original version was done by Kansas Joe McCoy and Memphis Minniein 1929.  Wanna hear it?  Click here:
http://www.youtube.com/watch?v=bZ0eZiarvEE

(Edit):
A day or two after posting this song, I realized it could use a coupleof those guitar riffs if you want to play the "harp" tab and the"vocal" tab together. 

It's late, I'm tired and I couldn't stop myself¦I had to post thefollowing without downloading the midi to my software again, so thismay not be quite accurate.  Close enough, I think.



Here's that catchy guitar riff before the vocal passage:
(Play twice)
6 6 6 6 6    6 -6 -6 -6 -6 -6    
-6 6 -6 -4                          
-6 6 -6 -4                          


And the other familiar guitar part:

(Play twice)
-6    -8 -8
 6     7  7
-5    -6 -6    7 7 -8

And the other guitar part kinda like above, but with more notes:
(Play twice)
-6 6 -5  -8
-6 6 -5  7
-6 6 -5    7 7 -8