Burn In... the Age Old Question, Cables, Components, and Speakers

First, if I choose to burn in my new speaker cables playing only Pink Floyd or something like a Windham Hill Electronic collection, both on CD, will eventually my cables be best suited for those two types of sound? Not that they would not be good for other music, but would they be BEST for the Pink Floyd or Windham Hill sound?

Second, do components need to burn in too, like a new CD player, or even (don't laugh) an Amazon Echo Link?

Third, I'm mostly sure that speakers NEED to burn in because the last time I bought new ones (Focal Arias) I got home, hooked them up and could not wait for the amazing sound that I knew would spring forth, but alas, they sounded like a pair of White Van Speakers and my heart sank into my stomach. Then as I was getting everything set to return them, (about 3 hours later) I returned to the music room and to my amazement I was listening to the best pair of floor standers I have ever heard. Then over a few days time, they were even better. So I kept them, and they are just great. 

So... any comments anyone?