Try putting songs from a computer in to a usb. From there plug usb into a ps3 port. Go to you to your music on the ps3 and you should see your usb. Highlight it and press triangle. Then press the DISPLAY ALL option and if you had your music placed straight in the root of the usb then all your music is going to show if its in a specific folder well open the folder and you should see your music. Next highlight the song you want and press triangle and you should get an option saying copy. Press that and copy to your ps3. You can also copy multiple songs at a time. Hope this helped.