A lot of people don't know this, but the King of the Hill theme is called The Ballad of Hank Hill and was actually written by Green Day.  I checked out the few other listings for this and liked them all, simply because mine isn't the actual thing either, it's just what i figured out.  If you like it great, if not, great.  This is also my first attempt at this so I hope it turns out ok.  Here goes.
                  You know the beat.
-----0-0-----0---I------------------------------------------------I
-----1-1-----0---I------------------------------------------------I
-----0-0-----1---I----------------------------------------------9-I
-----2-2-----2---I--------------------------------2-0-----------9-I
---3---------2---I--------53-------------------53-----2-0-------7-I
-----------0-0---I--0-3-5----0-3-5-4-2-420-3-5------------3-530---I
             ^
          Let ring