Composed by Arnaud Roy (a.k.a Flybyno), the Endless Space 2’s DLC "Lost Symphony" OST includes 7 tracks in lossless .wav format in addition to the original game soundtrack.

"Soft ambient trance and aphotic orchestral music will take you on a trip amongst the stars of the universe with FlybyNo’s Endless Space 2. FlybyNo’s compositional skills are superb as ever on this soundtrack; the use of orchestral music, synthetic drones, and percussive elements will leave you on the frontier of the pure and vast unknown. Trance-like beats fill the microcosm of unexplored space between the grooves, while Arnaud’s signature harp flutters down, leaving you floating in an ethereal and peaceful swathe of strings." -vgmwax.com