Jack Nitzsche's soundtrack for Paul Schrader's Hardcore  has never been officially released, but Twilight Time's recent Blu-ray re-issue features an isolated score audio track, a cue from which is featured above.
Mirroring the film's structure, the score opens with religious themed organ music and slowly transforms into seedy pulsating synths as George C Scott travels in search of his daughter. These two opposite textures occasionally blend together, an example of which can be heard at the tail end of the uploaded cue.
I recommend browsing Twilight Time's website to take a look at their Blu-ray catalogue. It's nice to see some love given to forgotten titles such as Arthur Penn's The Chase , Andrei Konchalovsky's Runaway Train  and Alan Parker's Mississippi Burning , all of which also include isolated score tracks.