Katy Perry - Last Friday Night tab

the other tabs are close but I thought I'd tidy things up and make it completely correct.
pretty easy song, just the same 4 chords played in the same rhythm the whole way through 
but hey it works and it's damn catchy!

       B                      Abm                    Ebm                    C#
e |----7--7-7---7--7-7---|----4--4-4---4--4-4---|----6--6-6---6--6-6---|----4--4-4---4--4-4---|
B |----7--7-7---7--7-7---|----4--4-4---4--4-4---|----7--7-7---7--7-7---|----6--6-6---6--6-6---|
G |----8--8-8---8--8-8---|----4--4-4---4--4-4---|----8--8-8---8--8-8---|----6--6-6---6--6-6---|
D |----9--9-9---9--9-9---|----6--6-6---6--6-6---|----8--8-8---8--8-8---|----6--6-6---6--6-6---|
A |----9--9-9---9--9-9---|----6--6-6---6--6-6---|----6--6-6---6--6-6---|----4--4-4---4--4-4---|
E |----7--7-7---7--7-7---|----4--4-4---4--4-4---|----x--x-x---x--x-x---|----x--x-x---x--x-x---|

To me, it sounds like the guitar part was recorded half a step down, so should you wish 
to strum along the chords like this, you can tune down your guitar and play these chords.
Of course these will be the same chords as above but I have written out the names as 
they would appear in standard tuning.

        C                      Am                     Em                     D
eb |----0--0-0---0--0-0---|----0--0-0---0--0-0---|----0--0-0---0--0-0---|----2--2-2---2--2-2---|
Bb |----1--1-1---1--1-1---|----1--1-1---1--1-1---|----0--0-0---0--0-0---|----3--3-3---3--3-3---|
Gb |----0--0-0---0--0-0---|----2--2-2---2--2-2---|----0--0-0---0--0-0---|----2--2-2---2--2-2---|
Db |----2--2-2---2--2-2---|----2--2-2---2--2-2---|----2--2-2---2--2-2---|----0--0-0---0--0-0---|
Ab |----3--3-3---3--3-3---|----0--0-0---0--0-0---|----x--x-x---x--x-x---|----x--x-x---x--x-x---|
Eb |----x--x-x---x--x-x---|----x--x-x---x--x-x---|----x--x-x---x--x-x---|----x--x-x---x--x-x---|
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