Games that will allow you to import their songs into Rock Band include:

If you've exported tracks from any of the Rock Band games that let you do so, their songs will be available to play in Rock Band 4 after launch. If support for any of these tracks comes to Rock Band 4, it'll be after launch. There's no official word on whether any of these songs will get brought back to Rock Band 4 through official means, let alone whether you'll be able to download them for free if you purchased them in the past. And since neither the PS4 or Xbox One support this framework, porting these tracks over means recharting all of them specifically for Rock Band 4 - which opens up a whole new can of licensing worms. Once Microsoft stopped supporting XNA, RBN all but shut down. XNA was a programming language created by Microsoft specifically to enable easy game creation on PC and Xbox 360.

The issue stems from the XNA framework these tracks used when RBN was active. RBN features over 2000 tracks from a wide variety of indie and major artists, from all corners of the globe - and as of launch, none of these tracks are making their way into Rock Band 4. In addition to the main offering of DLC tracks that Harmonix themselves licensed and released, there was also a massive library of independently-created and published tracks made available in the Rock Band Network.

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