Let’s get the party started. And just as important — let’s keep it going. iTunes DJ takes care of the musical entertainment, so you can relax and enjoy your party. Open iTunes > Preferences (Windows — Edit > Preferences), click Show iTunes DJ, and then click OK. Select iTunes DJ from the Source List and iTunes creates a random playlist from music in your library. If you like you can change the source (at the bottom of iTunes DJ playlist) from Library to a select playlist.
More Party Shuffle options let you choose to see the last 5-100 songs played or none at all, as well as the next 5-100 songs that will play. Another nifty option lets you direct Party Shuffle to play higher-rated songs more often. Using these options, you can add, remove, and rearrange songs in the random playlist on the fly, leaving you with an awesome playlist and more time to party.