Mp3 Download not functioning

I'm offering a sermon downloading site and I have a user experiencing an issue with his download. Anyone have any ideas on how I can improve this code, or perhaps send better headers...

$path = "http://www.domain.com/sermon_files/".date("Y", $array["preached"])."/".$array["filename"];
$corePath = "/home/user/public_html/sermon_files/".date("Y", $array["preached"])."/".$array["filename"];
if (!file_exists($corePath)) {
    echo "An error has occured with this download.";    
} else {
    header("Pragma: public"); // required
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private", false); 
    header("Content-Type: audio/mp3");
    header("Content-Disposition: attachment; filename=\"".$array["title"]."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".filesize($corePath));
    readfile($path);
    exit();
}

Solution

Take a look at this thread, I had similar problems: PHP: Force file download and IE, yet again. Also consider using Fiddler to capture the exact HTTP headers that are being sent to the client.