Note that this process may take time, and while many tracks are already available, some are still working their way through the approval process, according to Harmonix.

We do not yet have a comprehensive list of DLC tracks that have been cut, but we do know more than 1,700 songs are set to arrive in the store over the next few weeks. Unfortunately, due to licensing restraints, some classic songs will not be available. The good news is, each legacy track that's available in the store has been reauthored to accommodate new features unique to Rock Band 4 like Freestyle Solos. If you stayed within the same console family and still the use same account you had when you bought all those songs, the store should simply recognize which entitlements you already own and allow you to re-download those songs for free.The bad news is, you have to download each song individually, as batch downloading is apparently not possible at this time. I bought a ton of downloadable tracks for all the previous Rock Band games.

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