How do I export Green Day Rock Band songs to Rock Band 4?
You can export songs from Green Day: Rock Band to Rock Band 4 only if you previously purchased the export.
The Green Day: Rock Band export offer has expired. If you did not purchase it when it was available, you cannot export these songs.
Xbox
Press Menu on the Rock Band 4 tile.
Select Manage Game.
Scroll to Ready to Install.
PlayStation 4
Search for Green Day: Rock Band Export on your console's Store or the PlayStation Store website.
Some songs from this release were featured as standard DLC.