Wait until the keyboards or whatever plays the funky thing once.
Then proceed to Riff 1.
(Note: It of course is easier to play it by just shifting your hand once, 
but D'arcy usually plays everything (EVERYTHING) on the E string. Your choice.)

Riff 1
Gb|—————————————————————————|
Db|—————————————————————————|
Ab|———————————————55—8—77———|
Eb|—33—6—55—8—————————————8—|

Play that three times and then:

Riff 2
Gb|————————————————————————————|
Db|————————————————————————————|
Ab|———————————————————88888888—|
Eb|—00000000—88888888——————————|

Play that once then Riff 3.

Riff 3
Gb|——————————|
Db|——————————|
Ab|———2—3————|
Eb|—0—————11—|

Then Riff 2, then Riff 3 three times. 
Play an Ab each time after you play Riff 3 for "an extra kick".

Play Riff 1 three times or so, then the chorus thing.
Then we have the bridge (?)

Bridge
Gb|————————————————————————————————————————————————————
Db|————————————————————————————————————————————————————
Ab|————————————————————————————————————————————————————
Eb|—55555555/11111111/10—10—10—10—10—10—10—10/33333333—

Gb|————————————————————————————————————————————————————————————————————|
Db|————————————————————————————————————————————————————————————————————|
Ab|————————————————————————————————————————————10—10—10—10—10—10—10—10—|
Eb|—55555555/11111111/10—10—10—10—10—10—10—10/—————————————————————————|

Then play the Riff 2, Riff 3 thing. 
Then play something like this.

Riff 4
Gb|————————————|
Db|————————————|
Ab|————————————|
Eb|—333—333—3^—|
This is kinda weird. Bend the Gb some where in there...
When the song finishes, strike an Eb.