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Use your index finger, sliding it around the neck, as much as possible. Learn the implied guitar chords for the verse. Fix up your amp.
Get used to moving your whole hand fluidly across the guitar to master the above riff. Use your index finger to fret as much as possible instead of switching fingers -- you'll need your ring and pinkie free to make chords later on. Listen closely and you can hear Jack White sliding around the guitar. It is most pronounced right before he launches into the riff, sliding into that 7th fret note. If you were to play the song with just an acoustic guitar, for example, you'd need to know the chord melodies. But these chords could be used for any cover or version -- look at Marcus Collins version, which uses rhythm guitar in the verse where the original has none. To play chord melodies, simply play the following chords -- each chord times up to the same note in the bass riff above. E (7th fret, 5th string) G (5th fret, 4th string) D (5th fret, 5th string) C (3rd fret, 5th string B (2nd fret, 5th string These can be played as straight chords or powerchords. To get a real "White Stripes" sound from your guitar, your amp needs to be adjusted a little. Don't worry, you're not opening anything up, just change the settings a little. You'll need quite a bit of gain, try turning that up to 8. To even that out, keep your treble all the way up to 7 or 8 too. Keeps the mids at 5 while the bass should be pumped up to 8. If your amp has an effect called "Presence", turn that up to 8 too.