Where's the music from?

[The Punisher]

Pretty sure I've heard this in another game before

[archl]

Sure you shall know Zero-K is free&open source(as in distribution&more), it need funding or skillful people to contribute free music for Zero-K specifically, otherwise use current existing suitable music is the viable choice. You may view(or do whatever) the source code at https://github.com/ZeroK-RTS/ and locate the music at https://github.com/ZeroK-RTS/Zero-K-Artwork/tree/master/music

[GoogleFrog]

Most of the music is by Denny Schneidemesser http://www.dennyschneidemesser.com/ licensed under CC-BY-NC-ND from here http://www.soundclick.com/bands/page_licensing.cfm?bandID=604509

Some of the lobby music is by Grégoire Lourme http://www.jamendo.com/en/artist/gregoire.lourme