Okay, so, this was supposed to get the paths of all mp3 files in a folder, read their metadata and put in an arraylist.

public static List<String> OrgMetadata(List<String> rawgenrelist){

    File folder = new File("C:\\SOM\\");
    File[] listOfFiles = folder.listFiles();
    //File path = listOfFiles;

    for (int i = 0; i < listOfFiles.length; i++) {
        String pt = listOfFiles[i].getAbsolutePath();
        File src = new File(pt);
        MusicMetadataSet src_set = new MyID3().read(src);
            if (src_set != null && listOfFiles[i].isFile()) {
                IMusicMetadata metadata = src_set.getSimplified();
                rawgenrelist.add(metadata.getGenreName());
            }
    }

    List<String> genrelist;
    genrelist = new ArrayList(new HashSet(rawgenrelist)); 
    return genrelist;
}