This idea is about a genre of audio tracks to lull people to sleep. There could be a range of them, 20 minutes to an hour or two in length. All of them involve crunchy gravel.
'the escape': gunfire, footsteps, engine revving, then a progression of road noises from cement, asphalt, then finally turning
off to a slow crawl through crunchy country gravel roads.
'to the valley': Just a slow drive down a gravel road with the windows open. wind noise, birds chiping
'walk to the hideout': Heavy footsteps on gravel, it's a long walk. night birds, owls hooting, loons
'bury the evidence' this a digger scooping and dumping gravel, driving over gravel