We know that android kitkat comes with a beautiful feature of changing music tracks without unlocking phone. The option appear on the top of the lockscreen. But if you aren't lucky enough to have kitkat update you can still do it without any softwares!
Step 1: Open Google Music App.
Open Google Music(it comes pre installed) and choose any track.
Step 2: Lock Your Screen.
Step 3: Changing the Tracks
if you wanna change the track you are just listening, press the home button or power button and view the lockscreen.
Step 4: Voilà!
Now you can change it!
Without any software and stuff.