A great feature of the Music app is the ability to create song playlists so you can listen to specific jams depending on how you’re feeling and what you’re doing at a particular point in time.
On the other hand, sometimes you might inadvertently add the same song to a playlist more than once, which means you'll have duplicate songs in the same playlist. As annoying as this can be when you’re in the middle of listening to it and hear the same song more than once, a new jailbreak tweak dubbed Dejavu aims to fix the problem.