Music players isn't finding tracks on Samsung Galaxy S3! The music player in Samsung galaxy s3 isn't finding my tracks. I tried different application like google play music but nothing seems to read my tracks at all. 
This problems happened suddenly I don't know why. 
I tried rebooting the phone but with no hope.
I solved this problem by going to Settings->More->Application manager->All->media storage. 

I tapped Media Storage then Clear Data. 

Then, at Settings->More->Application manager->All->My Files, I tapped Clear Data too.

Finally, I restarted the phone. And it worked.