Its fun to have a lot of your music on your iPhone and to be able to jump from song to song at a party, in the car or wherever. But when you want to do something better than cutting off one song to go to another, look into some of the cheap live mixing apps like djay. With this you can fade one song into another, match beats, play with loops and scratching, and so on. Lots of fun with your iPod music library. There’s even an automatic mode that is a better way to listen to your playlists and shuffle than the built-in iPod app.