the main bass line at the start goes something like this, i play it on guitar , it varies in rythm a lot
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------6-----6------6----  6---------6----4------------4---5------------6-----4-
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---4---- 4------4---- 4-------4-----------------4---------------4--------------

the main rythm: slide the fingers for full effect
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--------6-/8-8-/10---------------6/-8-8--/10-----------------------------------
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---4------------------------4------------------------------------------------

after around 1 min 30 do the same notes just on different strings.bend and slide to give more oomph.
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--------------------6 / 8 8/ 10-------------------------------------------
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after around two mins thirty my fave part of the song comes in:, to set yourself up for it noodle around on the fifth string for a few seconds to get the rythm. bend the strings upwards on the first notes and put the guitar in treble to get the best effect. keep the strings steady when you bend them or it sounds bad. start with first finger on3rd fret and little finger on 6th fret.
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--------6--5--2--4--6,6--5--2--4--6,6--5--2---5--2--3--5--7--9-----
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then it just does the main core of song again. Do a bar chord version of the mains riff for when perry starts singing "theres so much space etc. you can work it out.
email me @ jackbull180@hotmail.com and tell me what you think!