Help - scrambled brain!!
All answers are song titles.
19. Partially burnt & hilly, lakes, rivers, forests U.S. state
53. Two or more produced, us, not sitting
82. A day before, King George sixth & Prince Harry
Black Hills of Dakota doesn't seem to cover all parts of the clue to me, and I doubt hilly would be in the clue to 'hills ', and 'partially burnt' doesn't suggest 'black' to me.
I have no better suggestion though