static L<File> findMusicFiles() {
  L<File> files;
  loading {
    files = findAllFiles(concatLists((L) findDownloadDirectories(), ll(
      userHome("Music"), userHome("My Documents"),
      userHome("Eigene Dateien"),
      "/big/stuff")));
  }
  ret filter(files, func(File f) {
    S name = f.getName().toLowerCase();
    ret endsWithOneOf(name, ".mp3", ".ogg", ".wav", ".flac");
  });
}