What Does Karaoke Mean?

This is a fact that I learned from "How I Met Your Mother". Karaoke is Japanese for "empty orchestra". On the show they called this "hauntingly beautiful". I call it "hauntingly confusing" because I don't really know what it means. To me it's as good as meaning something totally random like supplements for weight loss. It should really mean "empty of a trained singer" because the background music is still there. So now that we know what the word itself means, does anyone know what the meaning means?