
Barley
Historically, the most common grain used for making whiskey and integral to making Scotch, Irish Whisky, and Japanese Whisky today. Typically is malted but can be used unmalted as well. Single malt scotches are regarded as some of the best and most complex whiskies in the world.

Rye
Rye became a popular alternative to Barley when settlers in America began distilling their own whiskey. Rye tends to create a spicier, dryer whiskey than Barley, and became more preferred as it grew better in the new world climate.

Corn
Corn also became a popular alternative to Barley in America, and the most common whiskey grain used in American whiskey post-Prohibition. Today, Corn is most recognized in Bourbon, which by law must be at least 51% Corn.
