What is the Silliest Accessory You Have Ever Seen.

"Music always sounds better with the lights out."
Not for every listener.   

@roxy54  Your ability to focus on music improves when you have no visual input. It is why we have had so many totally blind fabulous musicians. You transfer sonic interpretation to the visual cortex at the back of your brain. Proven fact. 
If your system does not sound better with your eyes closed you have work to do. 

My thoughts on why the music is better with lights out or eyes closed.

The brain is a powerful processor but it does have limits. So if you close your eyes and listen in the dark does your brain use the now unused processing to further enhance the portion that processes the audio portion. Tom 

Gee we agree on something. Tom

That is exactly right Tom. Strange things do happen:-)