"Serenity" or "Dream Town" is an ambient music track composed by Mark Morgan and used in the Fallout 2 and Fallout: New Vegas soundtracks. The track is available as a part of the Vault Archives compilation.
The track was originally composed for another game, Netstorm.
The song plays in Fallout 2, it plays when the Chosen One is in Modoc. In Fallout: New Vegas when the Courier visits the Gomorrah courtyard, Vault 21, New Vegas medical clinic, Jack Rabbit Springs, Hopeville armory in Lonesome Road and several other unnamed locations.