Why do cables need break-in?

Could someone please produce some sources for this? Like, not from people selling cables.

How about, "Hooked on 'electron'ics".

Not a single scientific explanation here...I'd like one, please!

I suppose, you are very well aware of the fact, that there is no really convincing scientific explanation for this.
Our ears tell us though, that this phenomenon exists. So if you " believe " in science, you'll say that the ears are wrong and if you believe in what you are hearing, you'll say that science falls short of the fact and cannot explain it. P l e a se lets not start this argument again, because it leads nowhere!

There has to be. It's called MSE, or materials science engineering. Some things have no scientific explanation (that's why I'm Psychicanimal--I saw in a dream the girl I'm in love with the day before flying to her country and met her two days later...wow!) but something like this in the 21st century must have one.

To start, science is not a belief. I am a professional scientist. I do not 'believe' in science. Scientific activities search for truth through a systematic process. That's why it starts with observation (or hearing, in this case). Questions arise, hypotheses are formulated and experiments to sustain or defeat those hypotheses are conducted. An inseparable part of this is a process called validation (Quality Control/Quality Asessment).

Does anyone have any validated data sets/explanations?

I do not wish to create controversy. I bought some silver plated copper speaker wire very cheap and two people I really trust told me there would be a long break in perion for the silver. That the sound would get better. How can this be?