Official comment
You can rebuild the rekordbox playlists from your USB drive by following the instructions here, but iTunes you would have to do manually by dragging-and-dropping from rekordbox > iTunes.
Hi, Im seriously hoping someone can help, I lost all the data from my laptop and bought a new one. I have my old USB stick with tunes/playlists on using Rekordbox. What I want to know is can I get those playlists back onto iTunes with all the tracks, kinda like how you put them on but in reverse. Ive got tons of playlists and would love to be able to add to it via iTunes.
You can rebuild the rekordbox playlists from your USB drive by following the instructions here, but iTunes you would have to do manually by dragging-and-dropping from rekordbox > iTunes.
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If you are on MacOS the DJ Conversion Utility can help you out. As Pulse already points out you can import the contents from a CDJ USB back to Rekordbox. DJCU can take it from Rekordbox to iTunes.
See this video how I use it to do exactly what you want (and a bit more)