Ok folks, I nearly completed the list of all query sounds used by maxis for the default ploppables, like schools, police stations, rewards, landmarks and so on. You can download the updated list below.

The idea behind this:
Most custom made ploppables are made as landmarks or parks. Therefor, whenever you query them, you get that annoying "woowoowoowoo" (parks) or that picturetaking "aaahh-oooohh" or the iconic big ben bell (landmarks). Well, this often doesn't suit, let's say for a nuclear power station, or an army gunning range.
With that list and ilive reader you now can change the query sounds by yourself. Just open the lot in ilive reader, find the building exemplar, then find the SFX:Query Sound property, and finally paste the desired value from the list. Done!
And of course, to customize the sound of your ploppables for your own desire, you can use fantozzi's wonderful Audio essentials (F.A.E.). You can find these here in fantozzi's post above, and in the LEX.
In my list, some entries are still missing. I couldn't read out the query sound property values for the airports and seaports, and for some rewards.

See the yellow markings in my pdf-list. Maybe anyone of you has approved skills to explore those values and add them to the list?