The Waltons showed '70s audiences life in the Virginia mountains forty years earlier in the Depression, when life was simpler and you could fill the tank with a gallon of gas. Originally a TV movie with Patricia Neal, it aired for nine years and won a boatload of Emmys.
Their opening credits used to take almost two minutes; watch them here. When they figured out they could get to commercial a lot faster with a shorter theme, they switched to the sepia snapshot look. (The original music wasn't really this fast; it's been compressed to allow for even more ads.)
The show centered around writer-wannabe John-Boy Walton, played by Richard Thomas. He had a mole and was wholesome. Though you wouldn't know it to watch him in this outtake.