They should try Wagner and pinot noir...

The louder the music the more we drink.

One study by Gueguen et al. (2004) found that higher sound levels lead to people drinking more. In a new study published in Alcoholism: Clinical & Experimental Research, Gueguen et al. (2008) visited a bar in the west of France to confirm their previous finding in a naturalistic setting. Here, they observed customers' drinking habits across three Saturday nights, in two different bars in the city.

The level of the music was randomly manipulated to create the conditions of a true experiment. It was either at its usual volume of 72dB or turned up to 88dB. For comparison: 72db is like the sound of traffic on a busy street while 88db is like standing next to a lawnmower.

Sure enough when the music went up the beers went down, faster. On average bar-goers took 14.5 minutes to finish a 250ml (8 oz) glass of draught beer when the music was at its normal level. But this came down to just 11.5 minutes when the music was turned up. As a result, on average, during their time in the bar each participant ordered one more drink in the loud music condition than in the normal music condition. [More]

 Well, duh!  It's not like you could actually talk instead.