In a good way.
Something about the layering of Pachelbel's Canon in D Minor (http://en.wikipedia.org/wiki/Canon_in_d_major) with Miliyah's singing (http://en.wikipedia.org/wiki/Miliyah_Kato) really struck me with its beauty. Oddly enough, I'd heard it a few times before and liked it, but it never really hit me before. It probably helped that I could understand a lot of it too when I really listened.
Love Is..., by Miliyah Kato, on Youtube: http://www.youtube.com/watch?v=1y0JGOXqRoQ
Oh, a few other people commented it made them cry too. That's somehow reassuring. :)
Edit: also available as it appeared in the "Toward the Terra" ending, with fansub translations: http://www.youtube.com/watch?v=QAFw44T-9r8