Cross posting from the announcement thread.
For those of you after the WormSong (Boggy B), I've done a little of the legwork.
http://www.multiupload.nl/FCD9NFEF03
Download the above file and replace the WORMS17.OGG in your 'Worms United' game folder. You may want to back up the original first. Up to you.
Enjoy.

The audio file is freely distributable as long as the readme stays with it, so there shouldn't be a problem.