.htaccess not working

This is driving me nuts. I've done it before and can't see why it's not 
working this time.

I've got an apache directory from which I want to force download of .mp3 
files

this is the .htaccess file:

<FilesMatch "\.(?i:mp3)$">
     ForceType application/octet-stream
    Header set Content-Disposition attachment
</FilesMatch>

It's a drupal site and .htaccess is placed in the directory that 
contains the offending .mp3

the headers module is activated.

Any help would be greatly appreciated.

-- 
David

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