sjoerd22. The songs are probably not showing due to the file folders they are in. Uconnect software will only read files that are 2 or less folders deep. Your folders should be arranged "My Music", "Artist" and then the files for that artist. You can have multiple artists, but you need to delete the "Album" folders that usually follow. Uconnect will NOT open these folders to look for music. My post above lines 8-11 explains how to structure the file system on your thumb drive. If structured correctly, Uconnect wil recognize MP3, WMA, M4A and other music files. My Uconnect has 3500 songs on it and they all play well. Good luck.