Grain does not dictate taste
Barley, rye, corn and wheat are often discussed as though each grain has one inevitable flavour. In practice, grain choice establishes a fermentable starting point while malting, milling, cooking and yeast determine what becomes available to the fermentation. A useful comparison distinguishes the grain recipe from the later decisions that shape the finished spirit.
Four grains, many legal contexts
Barley is important in malt whisky, while corn and rye feature prominently in many North American styles. Wheat can contribute to a recipe without needing to dominate it. Each category also has its own legal definitions, so a mash that may be called rye whisky in one market should not automatically be classified the same way elsewhere.
What the label really provides
When examining a label, look first for a declared mash bill or category and then for information about fermentation, still design and maturation. If a producer does not publish a recipe, WHISKAVIA should not infer one from a sensory impression.
Further reading
Original WHISKAVIA introduction; not a producer dossier or live travel listing.