This was supposed to be a hidden album which is linked to from various songs in Quarantine. If somebody clicked on the link, they will be presented with these 4 sound files which are less music and more an experiments in atmosphere.
The FM audio includes a sample from 96.7 FM mystery in Portland Oregon. Where people reported strange sounds happening sometimes on the radio station. Here is an LBRY link to a video about this mystery by Nexpo.
As I observed in my review of Predator 2, the Predator films feel very B-movie-like. And the first film, John McTiernan's 1987 Predator is not an exception.