It is a song harmonizing the melodies of Once Upon a Time and Memory/ His Theme. It plays while the protagonist travels throughout New Home and learns the backstory of Asgore, Toriel, Asriel, and the first human. Undertale is the 71st track in the Undertale Soundtrack.
Monsters talking to the protagonist through New Home Aren't you excited? Aren't you happy? You're going to be free.
