This is pretty much spot on, but email me with any corrections
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Riff 1
[G] -------------------
[D] -------------------
[A] --------------3-5--
[E] 5--5--5--5-5-------
This is played over the verses and for the intro...
Riff 2
[G] ---------------------------
[D] 5--5-4--4------------------
[A] ----------7--7-5--5--3-5---
[E] ---------------------------
...I wanna new bird,
yeah gimme a new bird etc..
This is the descending run played over the chorus
Riff 3
[G] ----5-57--5-75---
7757-7-----7--75- This is the fast bit in the bridge, it repeated
----------------- a number of times, then played an octave higher
----------------- starting on the 19th fret of the string.
That's it, listen to a recording to get a feel for the timing and structure.