Pure Silver Wire

@carlsbad2 

digital signals are 1s and 0s so lows and highs are transmitted equally

Strictly, digital 1s and 0s are interpreted from analog waveforms approximating square waves.  Picking the leading edge is important from a jitter perspective.  Approximating a square wave requires lots of higher frequencies in the signal, and that's in addition to the high base frequency - 1.4-Mbits per second for two channel CD quality.

@carlsbad2

while what you say is correct, it doesn't cause silver to preferentially transit one frequency over another

It might change the discussion focus, when debating digital interconnects, from resistivity to the skin effect at megahertz and gigahertz frequencies. 

Of course, the physical topology of a cable also matters.  At low frequencies (speaker cables) two parallel conductors might suffice but at higher frequencies coaxial cables take over until they in turn give way to very thin unshielded twisted pairs.  At higher powers and frequencies, tubes can replace solid rods, and multiple Litz strands can replace thicker wires.

All cable technologies have capacitance and inductance as well as resistance, and these do attenuate frequencies differently!

I wish there was more discussion about the use of aluminium as a conductor ... especially where low mass is beneficial - power transmission wires, speaker coils, moving coil cartridges.

@jmkrajnik 

Do you have experience in designing sound equipment?  Your comments are unusually insightful.

Unfortunately, no!  My dad did not own an engineering shop, so making tonearms and turntables were out of the question.  A dozen research scientists were working on loudspeaker designs at the British Broadcasting Corporation (BBC), which gave rise to many British loudspeaker startups, such as Harbeth, Rogers, Spendor and KEF.  Later you really needed access to laser interferometry laboratories and anechoic chambers to be competitive.  KEF in particular use a lot of computer modelling which does interest me.  That seems like 99% perspiration!

The 1% inspiration would have to have been the brilliant Peter Walker at Quad, with his valve and solid-state amplifiers, and ground-breaking electrostatic speakers.  The mathematics in his published papers are way beyond me!  He was an electrical engineer, through and through.  He famously said Quad left actual listening to its customers.