Is it a novel? Is it an anthropology textbook? Is it, possibly, both? Joel and Bill read Ursula K. Le Guin's 1985 text Always Coming Home, about a possible future people living in what is now the Napa Valley.
Also here's the bandcamp: https://ursulakleguintoddbarton.bandcamp.com/album/music-and-poetry-of-the-kesh
