Why is it that we are able to feel music more, when we close our eyes?

I can really hear it, and appreciate it more when my eyes are closed.

I was watching Idol (which I haven’t done in 5 years), after my Dad called me into the room, to check out some guy singing. He was good. :) I went into another room to work on my lesson plan for the following day, and turned on the tele in that room. There was a girl singing, and instead of looking and listening, I closed my eyes and just listened.

I find that I do that often, when listening powerful/moving musical artists. Why is that?