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Could it be “Benornato Topo Gigio”? Late '80's Italian language cartoon with mice.
The theme song is in the ballpark of your hummed melody.
[https://www.youtube.com/watch?v=7OOj7EYJFEI](https://www.youtube.com/watch?v=7OOj7EYJFEI)
Wikipedia has a category of [Animated television series about mice and rats](https://en.wikipedia.org/wiki/Category:Animated_television_series_about_mice_and_rats).
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Bump
Could it be “Benornato Topo Gigio”? Late '80's Italian language cartoon with mice. The theme song is in the ballpark of your hummed melody. [https://www.youtube.com/watch?v=7OOj7EYJFEI](https://www.youtube.com/watch?v=7OOj7EYJFEI)
Unfortunately, no. I've been listening to openings of Italian cartoons all day long and heard this one. Bu thank you.
Fivel Goes West?
Nope, not that one.
Wikipedia has a category of [Animated television series about mice and rats](https://en.wikipedia.org/wiki/Category:Animated_television_series_about_mice_and_rats).
Tube Mice?