You can always navigate to the 'Add-Ons' section of Rock Band 4 in the Main Menu to download any individual tracks you did not initially download from the purchase completion screen.

The exported Rock Band (1) tracks should be available in your song library to play! Be sure to restart Rock Band 4 if you do not see your recently downloaded tracks in-game immediately.

Once complete, navigate to your song library.

Press the white arrow located next to each track to begin the download process.

Selecting this will bring you to the PlayStation®Store for your free download.

If you have been verified, it will say FREE to the right of the Pack.

Start Rock Band 4 and navigate to 'Get More Songs.'.

The Harmonix website instructs PlayStation 4 owners to do the following, taken verbatim: Today, Harmonix announced that Rock Band 4 owners on PlayStation 4 can now begin importing their Rock Band tracks. The next step is getting songs from the original Rock Band onto the new-generation hotness and that process looks to have begun. Harmonix continues to work towards getting its old-generation, on-disc Rock Band tracks into Rock Band 4.

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