function cook( $s ) {
    $r = preg_replace(
        [
            '/,/',
            '/\s+/',
            '/^The /',
            '/For /',
        ],
        [
            '',
            '',
            '',
            '4',
        ],
        ucwords( $s )
    );

    return $r;
}

foreach ( glob( '*.mp3' ) as $filename ) {
    // Filename is in this format: "Artist - Title.mp3"
    // Extract Title:
    $title = preg_replace( '/^.*? - /', '', pathinfo( $filename, PATHINFO_FILENAME ) );

    $artist = preg_replace( '/ - .*$/', '', pathinfo( $filename, PATHINFO_FILENAME ) );

    $title = cook( $title );
    $artist = cook( $artist );

    // Square brackets in filenames cause id3.mp3 to not find the file, so we have to replace them with "?" in our filespec:
    $cmd = 'id3.exe -a "Artist" -l "Album" -t ' . escapeshellarg( $title . '-' . $artist ) . ' -M "' . preg_replace( '/[\[\]]/', '?', $filename ) . '"' ;

    echo "$cmd\n";
    exec( $cmd );
}