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Version 1.1.18
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Threedef 1.1 is free software! 
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User's Guide: Adding Music to Threedef's Library

The first time Threedef runs, it will prompt for an initial music library folder. Threedef will read and compile all artist, album, and track information contained in that folder or any of its subfolders, and make that information available for matching with the nine key pad.

To add more music folders, click on the Preferences page (Music -> Preferences).