Ok just as a disclaimer .. this version was taken off the original tape recording 
of the song .. depending on what you listen to, the key could be different 
.. just adjust urself along the fretboard because the fingering is always 
the same.

ok here is the main riff

G|————————————————————|
D|——————————5——3——————|
A|———5—3—5————————3———|
E|————————————————————|

ok then during the chorus there is a pause while MJ says the main line, nd then 
it goes back to the main riff


   "Cause it's a Thriller!  Thriller night!"
G|—————————————————————————————————————————————————————————————|
D|———————————————————————————————————————————————————5——3——————|
A|————————————————————————————————————————————5—3—5————————3———|
E|—————————————————————————————————————————————————————————————|

that does that everytime it goes into the chorus .. nd every chorus it goes 
twice 

Also break at the end of the chorus when MJ says killer thriller tonight .. 
then go right back into it

Then near the end some guy starts talking( supposed to be creepy but isn't) 
 anywho  the idea changes here then u start playing this.

G|————————————————|
D|————————————————|
A|—————3////5—————|
E|————————————————|

It isn't written in but it sounds cool

ok? so that is thriller  have fun