(emerging from lurk mode) The first two measures are a classic cartoon/PBS (sorry, I'm not sure which, but I strongly identify it with a show involving squeaky-voiced characters for some reason) "mystery" signal - the "uh-oh, something sneaky is afoot!" kind of theme. It may very well be something else as well, but I'm sure it was used for that. :) And I'm sure my brain will spend the rest of the day trying to remember *which* show it's from, now!
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