To add to Chelillingworth's concept, drill another hole in the fridge door for the beer tap. A quarter barrel will fit nicely or, if your pressed for space, a pony will work if your friends from Milwaukee don't show up. Sonically, a premium, full-bodied beer would be better. Don't get anything harsh or watered down as it will be reflected in the sound quality and anyone listening to your system will know you bought cheap beer.
