This is the bass tab for Seven Nation Army by The White Stripes on a C harmonica.
These riffs repeat throughout the song. The main riff is Riff#1. 

Notes with a "-" in front of them are the notes you suck in air rather than blow out.

The notes inside the parentheses are notes that you bend.

Riff 1:

5 5 6 5 -4 4 -3 

Riff 2:

5 5 6 5 -4 4 -4 4 -3

Riff:3:

3 3 3 3 3 3 3 3 (-3) (-3) (-3) (-3) (-3) (-3) (-3) (-3) 

If you can't play the full bends in Riff 3 on the -3 note then try the riff up an octave:

Riff 3 (Alternate):

6 6 6 6 6 6 6 6 -6 -6 -6 -6 -6 -6 -6 -6