It's possible it might have been used in a very minor way, perhaps as background music for a scene in a movie or TV show, but there isn't any well-known instance of it being a primary theme.
However, the "Light Cavalry Overture" is often used in:
* Classical concerts: It's a popular choice for orchestras and concert bands.
* Film soundtracks: It's frequently used in films, often in comedic scenes, battle sequences, or to create a lighthearted and energetic atmosphere.
* Television commercials: It's also a common choice for advertising, particularly for products that aim for a playful or energetic feel.
So, while it's not a specific theme song, "Light Cavalry Overture" remains a beloved piece of music often used in various media contexts.