American barbecue itself is a broad topic on its own. There are many diffrent kinds of seasoning in American cuisine and American barbecue. However salt , black pepper and garlic are considered the very basics of seasoning, as these 3 do not change or enhance the orignal flavor of the meat. There may be a hint of garlic in thier but it does not tamper with the orignal flavor of the meat rather complements with the umami flavour of the meat, which can be felt at the end of each bite and eliminates any off smell from the meat.