I came across this article on blog.kimlajoie.com written by the always entertaining Kim Lajoie about people who can sing well and how and why their singing voice affects the listener. Human beings can express many identifiable emotions just by the sound of their voice. A singing voice expresses the deepest of emotions and for many people this is why the lyrics of a song move them so much when they listen to it.
Worth your attention:
Dimensions of the voice