i dont know why a tab or chord site would be wrong it's pretty simple.....

we play it in A (could be a different key but this is a decent one to sing in) but it's still on really using te I, IV and V chords for most of it.

Verse and chorus is: I, IV, I, v, I

the bit after the solo when the progressoin change goes:

I, III, IV, V VI, I, V, I