$song = $_GET['mp3_id'];
$artist = $_GET['mp3_artist'];

......
$forum = $_GET['forum_id'];
$thread = $_GET['thread_id'];
$pid = $_GET['post_id'];
$user = $_GET['user_id'];
$result = dbquery("SELECT * FROM ".$db_prefix."threads WHERE thread_id='".$thread."' AND forum_id='".$forum."'";
$fdata = dbarray($result);
.....