Simple question, or is it...


What exactly is an audio signal made of, and what exactly is the medium it travels through in a cable??
thecarpathian
No. It's old stuff. The reasons can be found in a marketing 101 course. The more I read about "electricity" the more satisfied i am with my basic cables. 
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Those links from jea48 has some very good information in them though I don't think they say what he thinks they do. I think they agree more with what you've been saying though it doesn't get into directional or sound characteristics. The signal isn't in the energy it's in the wire.
djones51
... The more I read about "electricity" the more satisfied i am with my basic cables.
Yes, that's known as "confirmation bias."  Very common. Many of us have been there; many of us started as skeptics.