When you’re in the middle of listening to media via Apple’s Music app and you end up having to force-quit the app or respring your device for any reason, you’ll notice that the app never remembers your place in the song when you get the Music app up and running again.
A new free jailbreak tweak called MusicMark by iOS developer Tony Kraft fixes this by forcing the Music app to remember your place in a song whenever you respring or force-quit the Music app, effectively allowing you to resume where you left off.