Hillbillies

In my “theme songs that explain the premise” post a few days ago, I forgot to mention that the theme song of The Beverly Hillbillies not only explained the premise (and, as a commenter pointed out, still leaves enough room for a brilliant instrumental by Flatt & Scruggs) but plugged the sponsor’s product too. In the early seasons, the theme song was followed by an additional verse that served as a commercial for the main sponsor of the show, sometimes Kellogg’s cereal and sometimes this: