Instructions
Power on the PS3 and press the PS button on your controller to open the cross-menu bar. Dozens of menu options will appear on screen.
Select "Network" from the menu list by scrolling left.
Choose "PlayStation Store" under the "Network" menu then log in if it doesn&'t log in automatically.
Choose "Add-ons" from the "PlayStation Store" main menu. This will allow you to browse downloadable GH3 songs, among thousands of other items.
Browse downloadable add-on songs by choosing "Guitar Hero III" from the games list.
Choose the song or track pack you wish to download. This opens a download summary page where you can confirm the action.
Highlight and select "Buy now" to purchase and begin downloading the GH3 track pack or song. Funds will be removed from your PlayStation Store account upon purchase.