Garageband fails to export Artist, Album, composer

Hey Mindzman,

We'd recommend reviewing this article as it provides information on exporting GarageBand songs to a disk: Export songs to disk from GarageBand on Mac - Apple Support

"Export a song to disk

1. In GarageBand on Mac, choose Share > Export Song to Disk.
2. To rename the exported file, select the name in the Save As field, then enter a new name.
3. Choose a location to save the exported file from the Where pop-up menu.
4. Select the format for the exported file (AAC, MP3, AIFF, or WAVE).
5. Choose the quality setting for the exported file from the Quality pop-up menu.
6. To export only the part of the project covered by the cycle region, or only the part of the project defined by selected regions, select the “Export cycle region only, or length of selected regions” checkbox.
7. Click Export."

If that's not working as expected, we'd recommend contacting Apple Support for further assistance here: Get Support

Thanks!