The third installment in the series. Rarity singing as Cosette (Rarette).
I would've chosen a song where Cosette was older, but then I found out I couldn't sing that high in Rarity's singing voice (well not very well). Even though this song is by young Cosette, let's just say that she is recalling a time when she wasn't in the care of Jean Valjean (like a reprise).

Speaking best: #3
Singing best: #6

Instrumental: https://www.youtube.com/watch?v=hA8Ypcy6bf8

Disclaimer: I do not own Les Miserables or My Little Pony