[mrob]

"Ask somebody to list the classic ingredients of beer and the chances are they will come back with: hops, malt, barley and water, with a bit of yeast thrown in for good measure."

It seems strange listing both "malt" and "barley". Malt is just partially sprouted barley (or occasionally other grains). In most beers all the barley is malted. Some beers do contain both malted and unmalted barley, for example Guinness, but unmalted barley can make beer cloudy so it's usually only used in dark beers.