Adds 69 (1-9) instrumental tracks for your listening pleasure. Many thanks to Trent Reznor for releasing all his music as creative commons in multi-tracks and allowing the creation of this
I changed data.lua to spread the music over all default planets as well as space. Feel free to use it: https://gist.github.com/V0idhead/33977da8f39fe620962116fa2718f144
Also I noticed 67.ogg was present but not configured, so I added the track.
