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I agree with you, the word-descriptions of most bird calls are useless unless you already know the song. It's like saying a zipper makes a sound like "zzzip". Sure, once you know the sound, the description fits and reminds you of the sound, but not the other way around.
For most North American birds, especially on the level of feeder birds of the east, it's a perfectly good way to learn songs by watching a calling bird. If you live in a sufficiently wooded area, you're probably hearing additional songbirds that just hang too high in the trees, or too deep in the brush, to be seen easily. But for most of them (and realize "most" is slanted by my location in a brushy environment where nothing calls from much higher than 20 feet up), the best way is to spend time listening to a bird's call as you try to find it, choosing for yourself the description of the call, and then visually identifying the bird.
For what it's worth, the old Golden Guide had these funky graphs of acoustical readings along with range maps etc. I found the sonograms (which look like an earthquake tracing, but is essentally like a sheet of music with much compression) quite useful in sorting out bird songs.
A used cassette tape version of Stokes' guide to eastern bird songs is available on Amazon for $4, so you can get these things for pretty cheap.
I've never had any luck with picking other people's heads for advice with the calls. Living in South Texas, we get occasional tropical strays, which people with extensive tropical birding experience pick out by sound (which is much more important in finding tropical birds than it is with most temperate birds). I've not gotten much from their descriptions. So don't worry about giving in to extroversion for this purpose alone.
As to Carolina Wren, it has a complex range of calls. Don't feel bad about not being able to easily pick them out: besides something like 18 individual calls, there's also the matter of calls that sound similar to many different songbirds. And yes, the descriptions of wren calls is no better than other written descriptions (probably Canada-Canada-Canada or some meaningless phrase). The only wren whose call ever seemed easy to me is Canyon Wren.
Short answer: get the tapes or CDs. I use Stokes east/west guides, but there are some others out there. That's how I finally learned the songs.
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