I Gotta Feeling by Black Eyed Peas
I belive this is about 95% correct.


                                    Main Chords:

E---3--3--3--3---3--3--3--3----3-----------3-----------3---------------------|
B---3--3--3--3---1--1--0--0----1-(X8)----0-(X8)-----1-(X8)-------------------|
G---0--0--0--0---0--0--0--0----0-----------0-----------0---------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|

                                 Guitar Number 2

E----------------------------------------------------------------------------|
B----------------------------------------------------------------------------|
G----------------------------------------------------------------------------|
D----------------------------------------------------------------------------|
A-------------------------3-(16-Times)-----------------------3-(16-Times)----|
E------3-(16-Times)----------------------0-(16-Times)------------------------|


                        Fergie Sings Over This Part:

E----------------------------------------------------------------------------|
B----5---5---5---5-------6-5-6-5-6-5-6-5----8-5-8-5-8-5-8-5--8-5-8-5-8-------|
G------7---7---7---7---------------------------------------------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|


                                     Vocal Melody

E-------5--8-7-----------8---7-5--------8-7-------------8---7-5---------10-7-|
B-5-8---------------5-8-----------8--5--------------5-8-----------8--5-------|
G----------------------------------------------------------------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|

E--------------8----7-5--------10-10---7p5-----------------------------------|
B--------5-8------------8--5-------------------h8----------------------------|
G----------------------------------------------------------------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|

Some people have a hard time playing the vocal melody.  So here is an alternative way to 
it with more open notes (notes you don't have to press down on any frets to produce).

E---0-3-5---8-7----0-3-8---7-5-3-0--8-7---0-3-8---7-5-3-0--10-7--------------|
B----------------------------------------------------------------------------|
G----------------------------------------------------------------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|

E---0-3-8---7-5-3-0--10-10--7-5-3--------------------------------------------|
B----------------------------------------------------------------------------|
G----------------------------------------------------------------------------|
D----------------------------------------------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|

I recommend the first way since your hand is not moving all over the fret board.  But 
2nd way is worth a try.

Next we have the difficult version.  This is meant to be played without a pick.  Just 
each bass note once and let it ring out till you switch to the next chord.

E-3--3--3--3---3--3--3--3----0--------0---0----0-------0-------0--0---3---------|
B-3--3--3--3---1--1--0--0----1-(X6)-1---1----0-------0-(X5)-0--0---1-(X8)-------|
G-0--0--0--0---0--0--0--0----0--------0---0----0-------0-------0--0---0---------|
D-------------------------------------------0---------2----------------0--------|
A----------------------------------3------------------2-----------------------3-|
E-3---------------------------------------------------0-------------------------|

Or you could just rock out with G C Emin C.  Those are the 4 chords of the song.  That 
G major, C major, E minor, then C major again.  Rock out!     8-)