Not Tomorrow 3 is a song from Silent Hill: Origins. The song is track 5 in the game's soundtrack and was composed by Akira Yamaoka. It is heard early in the game, when Travis Grady gets out of his truck and sees Alessa Gillespie in the side-view mirror for the first time.
Parts of the song are also heard in Silent Hill 2 when James Sunderland confronts Eddie Dombrowski in his meat locker Otherworld.