"I Know the Truth" from Aida
"Il Adore" and "Petrified" and most of Act 2 from Taboo
"I'll Cover You: Reprise" from RENT (when sung right)
"In L.A" from Fame
"Come to Me" from Les Miz
"Sacred Bird" from Miss Saigon
"Fine-Fine Line" from Avenue Q
"Raven" from Brooklyn
"There are Worse Things I Could Do" from Grease
"Origin of Love" and Tommy's "Wicked Little Town" from Hedwig
"Somewhere That's Green: Reprise" from Little Shop
"I'm Going Home" from Rocky Horror (Tim Curry only, please. Sorry Tom Hewitt, but you didn't sound near as good at Tim in that song)
All of those songs have made me cry (or at the very least tear up) on more than one occasion. I remember bawling in the theatre when I saw Marcus Paul James sing 'I'll Cover You: Reprise' in Cincinatti earlier this year.
"Who says you can't bend over backwards and eat bugs if you want to? I guess the bugs would probably say you can't do that that, but assuming that they are willing and consenting bugs, then there's no problem. Let's wig out eating bugs."
-RuPaul