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One of my friends uses an old PC as a dedicated music center. He has thousands and thousands of songs on it, and outputs to a nice receiver and speakers. When people are over, everyone just takes turns picking 5 songs and adds them to the shuffled list. Everybody seems to like it, and it ensures that you are going to hear at least some tune that you like. You could use your Android/iPhone/iPod for the same thing, but I don't like giving a bunch of people access to my stuff. I guess if you are more “grownup” about it, you could use it as a free backup server.