Sorry, I have to remove it my response. I think you already got it sorted out..

ok, here we go again. I am not going to provide any link because, for some reason the mp3 I would like to be the demo for this response is misbehaving badly :).

I only tested this on IE, because that is the only one I have at the moment.

Here we go, we can provide link from any page using this syntax

    <a href="mp3streamer.php?file=pinkfloyd">Pink Floyd </a>

Ok, just to remind you that the file name is up to you. YOu can rename your mp3 like mysterysong101.mp3, it does not matter.

Here is the script..

    <?php
    ## Warning! not tested in firefox ONLY in IE. This script triggers the windows media player.

    if(isset($_GET['file']) && (!empty($_GET['file']))){
     $thisMp3 = mp3Streamer($_GET['file'],'.mp3');
    }
    else{

    //nothing 

    }

    function mp3Streamer($title,$ext){

    ## define secret directory
    $loc = 'uploads/';

    ## based on the known vars we have the actual filename, location, and extension
    $actual_file = $loc.$title.$ext;
    ## mime types possible
    $mType = "  audio/mpeg3, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg"; 
    ## we double check and make file exist
    if(file_exists($actual_file)){

    ## do as what we already know
        header('Content-type: {$mType}');
        header('Content-length: ' . filesize($actual_file));
        header('Content-Disposition: filename="'. $actual_file .'"');
        header('X-Pad: avoid browser bug');
        header('Cache-Control: no-cache');
        $mfile = readfile($actual_file);

        ## ! source src was left blank intentionally ##
        ###############################################

        $thisAudio = '<audio controls height="100" width="100">
      <source src="" type="audio/mpeg">
      <embed height="50" width="100" src="'.$mfile.'">
       </audio> ';
    die(); 
    }

    else{

    $thisAudio = 'not available';

    }

    return $thisAudio;

    }

    ?>

Good luck to you.. :)