Deep Blue, Memories, Relaxing, and Slow Motion by http://www.bensound.com (CC-BY-ND 3.0)
Enemy Ship Approaching by yd- http://opengameart.org/content/enemy-ship-approaching (CC0)
Melody D125 by Tri-Tachyon ( https://soundcloud.com/tri-tachyon ) - http://opengameart.org/content/guitar-fingerstyle-melody-d125
Search the World by Trevor Lentz- http://opengameart.org/content/search-the-world-trevor-lentz (CC-BY 3.0)
Seashore Peace Ambiance by Philippe Groarke- http://opengameart.org/content/seashore-peace-ambiance (CC-BY-SA 3.0)
World Travel by Dan Knoflicek- http://opengameart.org/content/world-travel (CC-BY 3.0)
Cave Theme by Brandon75689- https://opengameart.org/content/cave-theme (CC-BY 3.0)
Volcanic Caves by Janne Hanhisuanto for Radakan- https://opengameart.org/content/radakan-volcanic-caves (CC-BY-SA 3.0)
Underwater Theme by Cleyton Kauffman ( http://opengameart.org/users/doppelganger )- https://opengameart.org/content/underwater-theme (CC-BY-SA 3.0)
Spelunker's Anthem (Cave Theme) by TheMysticBard- https://opengameart.org/content/spelunkers-anthem-cave-theme (CC-BY 3.0)
Nautilus by poinl- https://opengameart.org/content/nautilus (CC0)