From Video Game Music Preservation Foundation Wiki
Important is the song that plays when the player (Ace Harding) has a flashback to something or if he's losing his memory.
Important is an unofficial title. The composer should be contacted for more info.
Déjà Vu (NES)
This song is track 5 in the NSF file.
Déjà Vu I & II: The Casebooks of Ace Harding (GBC)