The Rock Band 3 to Rock Band 4 export tool is now available on PS4 in North America and worldwide on Xbox One.
Developer Harmonix says that the tool will be available on PS4 in Europe next week, “based on testing and submission dependencies.”
To get the tool, you must login to the profile that Rock Band 3 was played on. From there, head to “Get More Songs”, then to the new “Exports” tab, then “Rock Band 3” and then “RB3 Disc Export Pack”.
The tool costs $15 USD and will export all 83 on-disc tracks.