Instructions
Double-click the "Windows Media Player" icon on your desktop with your left-hand mouse button.
Select the "Library" option on your media player, and then choose "Media Sharing."
Select "Share Media." Locate the device name for your PS3, and choose "Allow." Click "OK" to confirm the changes.
Turn on your PS3. Navigate to the "Media" option on your PS3 dashboard, and select "Music."
Choose the desired music file. Highlight the music file, and press the "X" button on the PS3 controller. The music now plays on your PS3.