Rye, oats, wheat and corn have traditionally been used to style ales. They make oatmeal stouts, hefeweizens, rye lagers and cream ales, Corn has traditionally been used to lighten dark bitters and ales and in light lagers and cream ales. Genesee Cream ale, Guiness (says they've stopped now) and Corona use corn. Rice is also used. You'll find it in Budweiser and Coors.
http://drinks.seriouseats.com/2013/...-grains-in-your-beer-oats-wheat-rye-beer.html
http://drinks.seriouseats.com/2013/...-grains-in-your-beer-oats-wheat-rye-beer.html
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