<?php
require_once('getid3/getid3.php');

$mp3= $_GET["mp3"];
$mp3 = str_replace('.png', '.mp3', $mp3);
$mp3 = str_replace('.jpg', '.mp3', $mp3);

$getID3 = new getID3;
$OldThisFileInfo = $getID3->analyze($mp3);

header('Content-Type: ' . $OldThisFileInfo['comments']['picture'][0]['image_mime']);
echo $OldThisFileInfo['comments']['picture'][0]['data'];
die;

?>