pipersong = ERH synth flute.wav 

Author ERH

http://www.freesound.org/samplesViewSingle.php?id=35809

license: http://creativecommons.org/licenses/sampling+/1.0/

Airblast.ogg
http://opengameart.org/content/spell-4-fire
Artist: Bart K.
License(s):
GNU GPL 2.0
GNU GPL 3.0
CC-BY-SA 3.0

Zombie Sounds
http://opengameart.org/content/zombies-sound-pack
Artist: artisticdude 
License(s):
GNU GPL 2.0
GNU GPL 3.0
CC-BY 3.0

Tornado.ogg
http://opengameart.org/content/whoosh-2
Artist: Bart Kelsey 
License(s):
GNU GPL 2.0
GNU GPL 3.0
CC-BY-SA 3.0