The track from the SYNTHETIK: Legion Rising soundtrack was originally composed by Pengus . It is titled "Content ID - 80's Deep Dark Synthwave" in music libraries.
While various users have uploaded the track to platforms like SoundCloud and YouTube under the title "Deep Dark Synth Main Menu," other notable contributors to the game's broader atmospheric score include artists like , who composed the track "Tension". You can listen to an extended version of this track here: SYNTHETIK OST - Main Menu Extended ShrtDrssd Vanes [Music] YouTube• Apr 25, 2021 SYNTHETIK: Legion Rising OST- Deep Dark Synth Main Menu