I just moved all my music to my memory card bjt then I realized that my music was gone I put then back but its still not showing up (I can see the music using the application my files) can you please help me im using a Samsung galaxy s3 mini
You're still seeing the MP3 file-names in the my files, but they're not showing or playing in the media player. I think you might have a counterfeit SD memory card. We've had a few posts about this recently, music, videos, photos and apps not working or vanishing.
There are a lot of fake SDs and USB sticks around. Did you buy the SD from Ebay?
Problem with fake storage devices, is that they don't work. They pretend they're storing your files, but they're not, they're only storing the directories and file-names, and maybe only a few actual files.