"How do you do, my name's Gavroche!
These are my people, here's my patch.
Not much to look at, nothing posh.
Nothing that you'd call up to scratch.
This is the land that fought for liberty,
Now when we fight, we fight for bread.
Here is the thing about equality,
Everyone's equal when they're dead.
Take your place, take your chance,
Vive la France, vive la France!"
They also outsourced Fantine's "come on, Captain" lines to two other whores, "Come on, Captain, did you wear your shoes?" being the changed first line and the "Don't it make a change to have a girl who can't refuse?" remaining the same. Then Fantine sings the rest of it.
And some of the lines from the Marius-and-Enjolras bits of Look Down were also outsourced to other students, since they had most of them onstage during Look Down, building a soap box platform for Enjolras and Marius to preach upon. I wasn't expecting the change, so I didn't take note of who sang what, and it's too hard to tell on the audio, but I'll pay more attention next time. It was definitely some combination of primarily Combeferre and Courfeyrac.
"Quand vous aurez besoin de Bahorel, capitaine, Bahorel est là! Je sais faire trébucher tous les chevaux du garde-corps avec une ficelle... Rien qu'une petite ficelle. Enfin, pensez à Bahorel du Café Musain!"