Samsung galaxy ace

[mariacaddle]

Hi I want to know why I'm always getting the message that my phone storage is low On the built in music app I can't download any songs so I downloaded a mp3 app The problem now is I have got two lists of the same music I've already got app 2 sd I think it's the mp3 apply that's causing the problem as the built in apps music is on my sd card I've tried everything PLEASE HELP