removing unneeded query from generated url string in php

I have the following string generating mp3 urls for a music player on my site.

<?php echo $song->getTitle() ?>
 

which results in /public/music_song/df/74/746b_2112.mp3?c=ec1e

I would like to remove the query from the string
resulting in /public/music_song/df/74/746b_2112.mp3

I've looked into how to split the url, but I'm nowhere near being a php genius just yet so I dont know weather to split or use preg_replace or how the heck to incorporate it into my existing string.

I have to get rid of these queries, they are unneeded and crashing my databases on a daily basis.

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