A couple moves into a house with a mysterious hidden room, which the husband uses as a man cave. It’s inhabited by a supernatural force. Only, instead of a demon yanking you over to another dimension or the mirror world or whatever, all this force does is turn you into a cave man.
So the husband starts having trouble putting sentences together, gets obsessed with hunting (and roasting) squirrels, and mostly wants to just stare into a fire while drinking from a beer hat. You can imagine this is frustrating for his wife. Turns out the house has been turning men into cave men for decades, and he links up with the local clan of cave men now roaming the suburb.
Obviously the score had to be primitive, and able to encompass horror elements. So this became a combination of percussion, vocal drones, and atmospheric sound design. The big rules were: no modern instruments, and no melodies.
Here’s the result on SoundCloud, from the end titles. I had to do a lot of overdubbing to get those grunts:
There are some great primitive scores out there. There is something iconic and very defining of the 80’s in Alan Silvestri’s score to Clan of the Cave Bear.