It’s interesting to me the flavors that grain can add to beer depending on the variety and how they are roasted. Brown ales have a nutty flavor with a little caramel from medium roasted barley, almost like liquid walnut with Samuel Smith’s Nut Brown ale. Porters and stouts are brewed with very dark roasted barley and have notes of coffee and chocolate. Wheat in wheat ale adds a banana flavor. Rye is uncommon in beer so I can’t speak to that, but the one rye beer I’ve tasted had a kind of earthy spice to it. Oats in oatmeal stout add a nutty flavor with a nice creamy texture.