Old Hydra sounds by Zeno Rogue <zeno@attnam.com>, under the Creative Commons BY-SA 3.0 license.

New Hydra sounds by Brett Cornwall <brett@brettcornwall.com>, under the Creative Commons BY-SA 4.0 license.

You can add additional music files here. Put the files in this directory and name them
music1.mp3 to music8.mp3, or music1.ogg to music8.ogg. I recommend checking out
the Rogue Bard: http://roguebard.eptalys.net/
