On some levels, you will hear the song "Late Goodbye" For example, in Chapter 4, when the janitor tells you the code for the door in one of the beginning chapters, he hums the song to himself. In Chapter 6, when you reach Mona's room, you can hear her trying to sing the song. In Chapter 7, before you kill the cleaners playing the piano, you can hear one of them playing a little section of that song. Near the end of the game, in one of the dreams, you see a cleaner trying to clean graffiti, singing the song.