You can easily convert the songs from the game files yourself.
All songs files are in "...\Divinity - Dragon Commander\Data\Public\Main\Assets\Sound" in Wwise Encoded Media format (.wem).
This thread explains how to convert this format to ogg:
http://forum.xentax.com/viewtopic.php?f=17&t=7792&start=15

The missing tracks are:
30255034.wem
32419842.wem
134136753.wem
196747528.wem
214173819.wem
467616453.wem
509842479.wem
743957102.wem
744233012.wem
832188967.wem
909614786.wem
1032594603.wem
1040801101.wem