Pearl Jam
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It uses a dropped D tuning (low E down to D)
The intro part is "holding down power chords and tapping on the fret board
12 frets higher with my index finger and pinkie, a la 'Spanish Fly'".
Then the next part is Octaves, D and C#
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---7----7----7----6----7----7----7----6--------------------
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---5----5----5----4----5----5----5----4--------------------
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The Main lick is:
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------------------------------po---------------------------
-----------------------------2--0---ho---------------------
---0--0--0--0--2--2--3--3----------2--3--------------------