cross-posted from: https://piefed.social/c/pixelart/p/1878734/justice-of-toren-humming-over-shis-urna
The lyrics are a translation of the French song "L'homme armé" which Breq (Justice of Toren) used to sing in the Ancillary Justice book.
It's a catchy song, too. The intervals are reminiscent of a natural horn, which gives it a martial feel.