Blade Runner soundtrack help finding a score?

I just watched this amazing movie the other night because I got the Collector's Edition on blu-ray which featrures all the cuts. I watched the international cut which includes a few seconds of more profanity and violence. Anyways, I'm sure the song is the same for all the films in this scene, but basically I wanted to know if anyone knew the name of this sequential score where Deckerd goes into the toymakers apartment complex. This is before he faces off Roy's girl. The music is ambient, kind of dark, a two-noter, but it sounds so amazing, and it's playing when he's looking for the bad guys, going up the stairs. This is as specific as I can be, but if there's a youtube link to that song, that would be so great. I wanna use it for something I'm editing.