Vera Keyes' "Begin Again" song is a holodisk in the Fallout: New Vegas add-on Dead Money. It contains Vera Keyes' voice, needed to unlock the elevator to the Sierra Madre vault in Heist of the Centuries.
Rather than a cassette like most holodisks, it can be found by accessing the music controls on the terminal, found on the desk by the front doors in the lobby of the Sierra Madre hotel. Downloading the ambient music for the restaurant, executive suites and theater will add a note to your Pip-boy. This particular note is the theater ambient music.
- Activating the greeter hologram from the same terminal will play some ghostly, almost indiscernible music, presumably featuring Vera Keyes' voice.