Pretty pleased to see one of my favorites doing well, especially when its original run flopped. At least according to Wikipedia, that was because of its plot and themes, which I find surprising since it’s the plot and themes that made this a favorite for me. Maybe because it can be depressing, despite (or for some, maybe partially because of) the final song?
I’m also a sucker for how the reverse chronology interacts with reprises. Our last encounter with the song is the characters’ first time with it. We know what happens the next time this song comes up in the characters’ lives, what happened the last time we heard this song, and probably can’t help but compare what’s in store for these characters with where they are now. Most reprises I can think of at the moment don’t make you painfully aware of dramatic irony, although I’m sure there have to be some reprises outside of Merrily that do.
Before I saw anything of this show, I thought the title song would be a version of Mary Had a Little Lamb because I’ve heard that tune done to the lyrics “merrily we roll along.” Wikipedia backs me up on those lyrics having been set to the Mary Had a Little Lamb tune before:
The "Merrily We Roll Along" chorus has the same melody as "Mary Had A Little Lamb".