Here is something that found out accidentally while playing around with the lock screen media control on Android. (This however is not truly original. There are already blogposts around explaining this feature!)
While playing media on your Android device, lock screen shows media controls. Usually it contains the album art, play/pause button and the back/forward icons. Here is the trick.
If you touch and hold the back or forward icon, you will get the seekbar, allowing you to navigate through the song or media that you are playing!