Joining mp3 files

I have a stand-alone Terapin mp3 recorder that I recently dumped a bunch of stuff to. However, instead of making one large MP3 file like I thought it would, it made MANY smaller mp3 files that are 13:00 each. Is there a small free utility out there that can join ALL of these small mp3 files into one large mp3 file?

Not sure, but maybe you can use Audacity