The tuning is standard although my guitar might be a halfstep down either way its the same thing :) enjoi Verse

H^Emard to ta^Gke, the days you j^Dust cant catch a b^Creak W^Emhen it br^Gings me down, i ^Dget right bac^Ck up

Chorus

Cause im po^Emwerful, inc^Gredible, Inde^Dpendent girl, ready ^Cfor the world Come ^Emon, toni^Gght im unstoppable, incredibly s^Dtrong tonight im un^Cstoppable Chorus

The w^Emorld is calling m^Ge out, d^Don't runaway come ^Con and shout

to get that effect at the end of each bar that they have play this

e-^C3-3-----0^Em-0 b-1-1-0-0-0-0 g-0-0-0-0-0-0 d-2-2-0-0-2-2 a-3-3-0-0-2-2 e-0-0-x-x-0-0

and thats it all there is too its very simple i believe she might play it a tab bit different but im sure this is as accurate as its gonna get http://www.youtube.com/watch?v=QwT4wxeLdHQ

China Anne McClain - Unstoppable