Hi i'm writing a download script for my site, but what am i doing wrong?

i'm getting the following error: Parse error: syntax error, unexpected T_ECHO in /public_html/mobdev/download.php on line 5

This is the download.php file

<?php
	header('Content-type: audio/mpeg'); 
	$f1 = $_GET['filename'];
 	$u1 = $_GET['url'];
	header('Content-Disposition: attachment; filename='echo $f1.mp3');
	readfile('echo $u1.mp3'); 

?>

it is called as following, on the page where users chose there content the click a link that is build up like this:
download.php?filename=My%20Favorite%20Swing%20(Hudson%20Mohawke%20Rework)&url=http://22tracks.com/secure/secure.php?file=20_07302010020725_De_De_Mouse-My_Favorite_Swing_Hudson_Mohawke_ReWork.mp3

can someone tell me what i am doing wrong?
thanks in advance!

    header("Content-Disposition: attachment; filename='$f1.mp3'");
    
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