I must thank my friend Michael K. for sending me this video from Britain's Got Talent, the UK version of American Idol. It features contestant Susan Boyle, a never-married, "frumpy" middle-aged Scotswoman whose voice prompted this awe-filled smile from Simon.
It also brought tears to my eyes.
Susan Boyle Sings on Britain's Got Talent 2009 Episode 1 @ Yahoo! Video
The longer version, with more comments, can be found here: http://www.youtube.com/watch?v=9lp0IWv8QZY