Things You'll Need
Instructions
Log into your PlayStation Network account, then access the PlayStation Store from the home screen.
Select "Add-Ons" from the PlayStation Store menu and click on the icon.
Scroll through the menu of game titles to select "Rock Band."
Select the icon entitled "Song Export Key," then click "Buy Now" to download.
Insert the "Rock Band" disc into your PlayStation 3 and load the game, then choose "Options" from the main menu.
Select "Export Songs" and wait as the content is saved to the hard drive of the PlayStation 3.
Eject the "Rock Band" disc and insert the "Rock Band 2" game disc.
Play "Rock Band 2." The exported songs will now be accessible through all game modes.