Here's how it goes. Basically a person names a Disney song and the next person writes down their favorite line from it, as well as a short explanation saying why. Then they write down a different song.

For example:

Person A: One song from Snow White
Person B: "Wanna hear a secret, promise not to tell?" - I love how cute she sounds when she says this line!

Something There from Beauty and the Beast

And so on!