Hmmm, the Merrily song that everyone keeps picking is Not a Days Go By, but I have to pick "Our Time". In the context of the show, that is possibly the most heartbreaking song I've ever heard.
This next one may seem odd since it's from a really funny show, but "Finale: I Imagine You're Upset" from Bat Boy, realy gets me sometimes (it might stem from my refusal to see the show as anything but an authentic greek tragedy).
then there are the "oh, of course" songs.
Elaborate Lives, I know the Truth from Aida.
For Good from Wicked.
"A Little fall of rain," Empty Chairs at Empty Tables from Les Mis
Now i have to ask myself, What part of Miss Saigon doesn't make me weep like a hungry infant?
there are many others, but i can't list them all.
did i mention im an emotional wreck?
when ducks grow thumbs then maybe my opinion will change.