If you want a direct download link like www.yoursite.com/songs/song1.mp3, you'll need to make a hard code change (back up the file before making changes, though).

You'll need to go to com_muscol/helpers/helper.php

Approximately line 363, find

$file_link = JRoute::_( 'index.php?option=com_muscol&view=file&format=raw&id='. $song->id );

and change it to

$file_link = JRoute::_( $song->filename );

This should result in a direct file link in every instance where a download link appears. I just tested this - If this is what you're looking for, it will work.

You'll also want to upload a blank HTML page within the songs folder, to limit the ability to gain access to the entire folder at once.

Apologies... refreshed my screen to get rid of an error, and it re-posted a few times.