The songs are released under GNU GPL, except :



SkyVibe-HighFrequency.ogg
--------------------
  Speedsound: CC-BY-SA v3.0
	modified by Constantin Pelikan

MayDayMayham.ogg
--------------------
  Alessandro Bottura: CC-SA v3.0
	modified by Constantin Pelikan

ChillCarrier-Druckverlust.ogg
--------------------
  Chill Carrier: CC-SA v3.0

BradSucks-OutOfIt.ogg
--------------------
  Brad Sucks: CC-SA v3.0

CaribbeanMusic.ogg,
another_caribbean_beat.ogg
---------------------------
  Lukas Siewert, license: CC-SA v3.0

g4m-fan-track.ogg
-----------------
  Paul Esra Martin, license: CC-SA v3.0

Boom_boom_boom.ogg
------------------
  Matt Thomas, license: GNU GPL v3 (or later)

kart_grand_prix.ogg
--------------------
  Weirwood, license: CC

Lava_Lagoon_2.ogg, 
Ethereal_Spectrum_(ver_loop).ogg
--------------------------------
  Asha B., license: CC

KingArthursCastle.ogg
---------------------
  Magne Djupvik, license: CC

amazon_jungle.ogg,
SwinginBeat.ogg
-----------------
  Atheal Washington, license: CC-SA v3.0

TheDeadRocks-EasyJob.ogg
TheDeadRocks-GreenSecretFromAmazonia.ogg
TheDeadRocks-OneMillionDollar.ogg
----------------
  The Dead Rocks, license: CC-BY-SA v3.0