Step 2: On your computer, open Windows Explorer or Finder (Mac).
Step 3: Locate the music files that you want to transfer to your PSP.
Step 4: Drag and drop the music files from your computer to the MUSIC folder on your PSP.
Step 5: When the music files have been transferred, safely disconnect your PSP from your computer.
NOTE: You can only transfer music files in the following formats to your PSP: MP3, ATRAC3, MP4, WMA. If necessary, use a conversion tool program or application to convert your music files into either an MP3 or WMA audio format prior to transferring them to your device.