The genre is by definition obviously film/game score.
As for each separate song they are obviously based on the respective cultures that Howard based his Hyboria on.
The AoC score is a masterpiece that elevates the game itself beyond a game to a piece of art. And yet, it still manages to pay homage to the epic score of Poledouris' - this is even noticable in Khitai music. Avenstroup Haugen is truly a masterful composer.