One Song Glory by Adam Pascal... That man has the most passionate, hurt voice I have ever heard. And Michael Ball singing Empty Chairs at Empty Tables. Also, I know it's not from a show, but I only cry when I hear Judy Garland's version of Have Yourself a Merry Little Christmas. That song makes me bawl.
"The stage is where I live and come alive and act out all the things that go on in my life. It's not just what I do for a living, it's my shrink and my love affair. No one in my life has ever or ever will kiss me on the mouth like this lover called my relationship with my performance."