A Couple Little Things I'm Wondering About

I have no idea what wiki says on electricity. Try here instead.
http://hyperphysics.phy-astr.gsu.edu/hbase/emcon.html#emcon

Make your own elevators out of cardboard. Take a listen. Please post results

Used elevators, listened , no difference. 

Of course this gives no useful information unless it was done in a controlled listening test and the results were repeatable. 

Really ? If it was audible then the only way you wouldn’t have a weird staccato effect in your music is if the wire floated. Either have the cable float or lay on something having little holders every so many feet or inches would really mess up the music, you know if insulation touching something was audible.

Yes, true placebos do work.

In a copper wire 12mm electrons will drift about 2.33 cm an hour

The current doesn't travel anywhere it isn't a thing but a concept. Electric current is the rate of flow of charge carriers in the conductor not in the dielectric. Electromagnetic energy flows outside the conductor,  most of it not all of it.  All the energy that flows in the conductor is used up as heat. The flow is close to the speed of light the miniscule amount of flow that is affected by a carpet or wood floor is barely measurable much less audible. The cable risers do nothing but calm the neurosis of the user.  If placing cables on risers affected the sound then your music would have a staccato effect as the flow passed over them. The whole notion of cable risers is ludicrous. 

You don’t need science to tell you that an insulated wire laying on carpet will change the sound coming out of your speakers degrading the clarity, detail, soundstage depth, and focus is so nonsensical it’s laughable. All it takes is a bit of common sense. Do you elevate your lamp wires so it shines brighter? 

You're not going to find honest physics on this forum to much hokey subjective nonsense. Cables resting on little cups or balls every so many feet has audible differences to laying on a carpet? If it wasn't so sad it would be hilarious.