For some reason some songs in your iTunes library are DRM protected.

If you enable the Kind column on your iTunes Library you see the file type for every song. In the example above Nimbus 2000 is a Protected AAC audio file.
There’s a way to import DRM protected and Apple Music songs into Mapping Tonal Harmony Pro. Here’s how:
- Download the track from Apple Music (if it is a song from Apple Music, if it as DRM protected you should already have it in your hard drive).
- Use MacSome iTunes Converter or similar to convert the track into mp3, or aac, etc.
- Open the audio-sync window in Mapping Tonal Harmony, select the audio-sync you want to replace and drag & drop your new converted file
- Remember to enable edit on the progression and save your changes.

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