A few months ago, I was trying to find out the name of the tune stuck in my head. I whistled it for some people who might know, and they guessed "Kleine Winzerin vom Rhein", a nice tune in one of our books, and pretty close, but not exactly what I was hearing:
Then yesterday, I found this video of "Waltzing in the Woods" -- that's it!
A little more internet research led me to the original German title, "Tief im Böhmerwald". There are plenty of versions to choose from. Here's Markus Fuchs, in a smooth Bohemian waltz groove: