VirginiaTam, I think it may be because we can feel that that woman believes what she is singing. Often some other singers appear to be just performing.

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I also like this version of "Farther Along":
http://www.youtube.com/watch?v=sc6mcKUucaw&search=I%27ll%20Fly%20Away%20brother%20where%20out%20thou

"Farther Along" By The Peasall Sisters