Как сделать чтоб mp3 закачивался на андроид

<?php
function downloadFile( $fullPath ){
  // Must be fresh start
  if( headers_sent() )
    die('Headers Sent');
  // Required for some browsers
  if(ini_get('zlib.output_compression'))
    ini_set('zlib.output_compression', 'Off');
  // File Exists?
  if( file_exists($fullPath) ){
   
    // Parse Info / Get Extension
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
   
    // Determine Content Type
    switch ($ext) {
	  case "pdf": $ctype="application/pdf"; break;
	  case "exe": $ctype="application/octet-stream"; break;
	  case "zip": $ctype="application/zip"; break;
	  case "doc": $ctype="application/msword"; break;
	  case "xls": $ctype="application/vnd.ms-excel"; break;
	  case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
	  case "gif": $ctype="image/gif"; break;
	  case "png": $ctype="image/png"; break;
	  case "jpeg":
	  case "jpg": $ctype="image/jpg"; break;
	  default: $ctype="application/force-download";
    }
    header("Pragma: public"); // required
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); // required for certain browsers
    header("Content-Type: $ctype");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile( $fullPath );
  } else
    die('File Not Found');
}
?>

ForceType application/octet-stream
Header set Content-Disposition attachment

header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );

header('Content-Type: audio/mpeg');

filename=\"".basename($fullPath)."\";"

filename=".$_GET['url']

<?php
$filename = basename($_GET['mp']);
header("Content-Disposition: attachment; filename=\"$filename\"");
header("Content-type: application/octec-stream");
header("Content-length: ".filesize($_GET['mp']));
echo file_get_contents($_GET['mp']);?>