Yeah Tom, the main point is that the actual power and information is carried to a speaker in an electromagnetic wave traveling along the outside(i.e. not inside)of the wire at about 3/4ths the speed of light. The small part of the wave energy that penetrates into the wire and latches on to the electrons there to guide the wave along the wire is lost as heat and doesn't directly contribute to the sound reaching the speaker, so none of this junk about the inside of the wire is significant. The movement of the electrons in the wire is very slow and if that was what actually carried the sound it would take an hour or so to reach the speaker.
