VIDEOS:
Herman and Katnip Theme
Apart from being possibly one of the earliest known examples of this trope (at least for Western Animation), Herman and Katnip's opening theme gives a fairly bare-bones synopsis on both the characters, and general plot of the series to give the audience a general idea on what to expect from this cat and mouse duo.
Example of:
Expository Theme Tune
Example of:
Have a Gay Old TimeExample of:
Have a Gay Old TimeExample of:
Have a Gay Old Time