Half-Life OST — Military Precision (Extended Mix) System Overlord 2026-09-25 | Half-Life OST — Military Precision (Extended Mix)
Half-Life — Military Hurricane Ambience (Mashup) System Overlord 2022-03-22 | Game: Half-Life Tracks: Military Precision / Cavern Ambiance / Hurricane Strings (Mashup)Composer: Kelly Bailey
Half-Life 2 — CP Violation in Kaon (Remastered) System Overlord 2020-11-21 | Game: Half-Life 2Tracks: CP Violation / Kaon (Remastered Mashup)Composer: Kelly Bailey
Half-Life — Diabolical Adrenaline Horror (Remastered) System Overlord 2020-11-12 | Game: Half-LifeTracks: Adrenaline Horror / Diabolical Adrenaline Guitar (Remastered Mashup)Composer: Kelly Bailey
Half-Life 2 — Phase Singularity (Mashup) System Overlord 2020-09-26 | Game: Half-Life 2Tracks: Pulse Phase / SingularityComposer: Kelly Bailey
Half-Life 2 — Hazardous Energy (Remastered) System Overlord 2020-09-05 | Remastered mashup.Game: Half-Life 2Tracks: Hazardous Environments / Dark EnergyComposer: Kelly Bailey
Half-Life — Adrenaline Apprehension and Evasion (Mashup) System Overlord 2019-11-09 | Game: Half-LifeTracks: Adrenaline Horror / Apprehension and Evasion (Half-Life 2 OST)Composer: Kelly Bailey
Half-Life — Nuclear Technology Rock (Mashup) System Overlord 2019-11-08 | Game: Half-LifeTracks: Nuclear Mission Jam / Hard Technology RockComposer: Kelly Bailey
Half-Life OST — Nepal Monastery (Extended) System Overlord 2019-10-02 | Game: Half-LifeTrack: Nepal MonasteryComposer: Kelly Bailey
Half-Life 2 — CP Violation in Kaon (Mashup) System Overlord 2019-09-26 | Game: Half-Life 2Tracks: CP Violation / KaonComposer: Kelly Bailey
Half-Life 2 OST — Trainstation 2 (Extended) System Overlord 2019-09-26 | Reupload of removed workGame: Half-Life 2Track: Trainstation 2Composer: Kelly Bailey
Half-Life 2 OST — A Red Letter Day [hl2_song10] (Extended) System Overlord 2019-09-26 | Game: Half-Life 2Track: A Red Letter Day [hl2_song10]Composer: Kelly Bailey
Half-Life 2 OST — Tracking Device (Edit) System Overlord 2019-09-26 | Game: Half-Life 2Track: Tracking DeviceComposer: Kelly Bailey
Half-Life 2 — Hazardous Energy (Mashup) System Overlord 2019-09-25 | Game: Half-Life 2Tracks: Hazardous Environments / Dark EnergyComposer: Kelly Bailey
Half-Life — Nepal Electric Pipes (Mashup) System Overlord 2019-09-25 | Experimental mashup done by combining of 3 OSTs of Half-LifeGame: Half-LifeTracks: Nepal Monastery / Steam In The Pipes / Electric Guitar AmbienceComposer: Kelly Bailey
Half-Life 2: Episode Two OST — Last Legs (Extended) System Overlord 2019-09-24 | Game: Half-Life 2: Episode TwoTrack: Last LegsComposer: Kelly Bailey
Half-Life 2 OST — Our Resurrected Teleport (Extended) System Overlord 2019-09-23 | Game: Half-Life 2Track: Our Resurrected TeleportComposer: Kelly Bailey
Half-Life OST — Electric Guitar Ambience & Drums and Riffs (Mashup) System Overlord 2019-02-22 | Game: Half-LifeTrack: Electric Guitar Ambience & Drums and RiffsComposer: Kelly Bailey
Half-Life OST — Valve Theme (Hazardous Environments) [Extended] System Overlord 2019-02-04 | Game: Half-LifeTrack: Valve Theme (Hazardous Environments)Composer: Kelly Bailey
Half-Life 2: Episode Two OST — Vortal Combat (Extended) System Overlord 2019-01-30 | Game: Half-Life 2: Episode Two OSTTrack: Vortal CombatComposer: Kelly Bailey
Quake II: Ground Zero OST — Pressure Point I (Extended) System Overlord 2019-01-29 | Game: Quake II: Ground ZeroTrack: Pressure Point IComposer: Sonic Mayhem
Half-Life OST — Nuclear Mission Jam (Extended) System Overlord 2019-01-26 | Game: Half-LifeTrack: Nuclear Mission JamComposer: Kelly Bailey
Quake II OST — Descent Into Cerberon (Extended) System Overlord 2019-01-20 | Game: Quake IITrack: Descent Into CerberonComposer: Sonic Mayhem
Half-Life 2: Episode One OST — What Kind of Hospital is This (Extended) System Overlord 2019-01-19 | Game: Half-Life 2Track: What Kind of Hospital is ThisComposer: Kelly Bailey
Half-Life 2 OST — Tracking Device (Extended) System Overlord 2019-01-17 | Game: Half-Life 2Track: Tracking DeviceComposer: Kelly Bailey
Half-Life 2 OST — CP Violation (Extended) System Overlord 2019-01-14 | Game: Half-Life 2Track: CP ViolationComposer: Kelly Bailey
Half-Life 2 OST — Trainstation (Extended) System Overlord 2019-01-12 | Game: Half-Life 2Track: Trainstation (Originally named as hl2_song27_trainstation1)Composer: Kelly Bailey
Half-Life 2: Episode Two OST — Sector Sweep (Extended) System Overlord 2019-01-11 | Game: Half-Life 2: Episode TwoTrack: Sector SweepComposer: Kelly BaileyUsed custom mod "Half-Life 2: MMod"Download from moddb — moddb.com/mods/hl2-ep2-enhased-mod
Quake II OST — Kill Ratio (Extended) System Overlord 2019-01-03 | Game: Quake IITrack: Kill RatioComposer: Sonic Mayhem
Quake II OST — Quad Machine (Extended) System Overlord 2019-01-02 | Game: Quake IITrack: Quad MachineComposer: Sonic Mayhem
Half-Life — Diabolical Adrenaline Horror (Mashup) System Overlord 2018-12-29 | Game: Half-LifeTrack: Adrenaline Horror & Diabolical Adrenaline GuitarComposer: Kelly BaileyP. S. The second version of the mashup, in my opinion sounds better than my previous work with these two tracks.
Half-Life OST — Steam In The Pipes (Extended) System Overlord 2018-11-26 | Game: Half-LifeTrack: Steam In The PipesComposer: Kelly Bailey
Half-Life 2 OST — Tau-9 [Drums and Riffs] (Extended) System Overlord 2018-11-21 | Game: Half-Life 2Track: Tau-9 (Drums and Riffs)Composer: Kelly Bailey
Quake II OST — Operation Overlord (Extended) System Overlord 2018-10-31 | Game: Quake IITrack: Operation OverlordComposer: Sonic Mayhem
Half-Life OST — Hard Technology Rock (Extended) System Overlord 2018-10-01 | Game: Half-LifeTrack: Hard Technology RockComposer: Kelly Bailey
Quake III Arena OST — Deathmatch (Extended) System Overlord 2018-09-08 | Game: Quake III Arena Track: Deathmatch Composer: Front Line Assembly
Quake III Arena OST — Quad Damage (Extended) System Overlord 2018-09-08 | Game: Quake III ArenaTrack: Quad DamageComposer: Sonic Mayhem
Quake II: The Reckoning OST — Stealth Frag (Extended) System Overlord 2018-09-01 | Game: Quake II (The Reckoning DLC)Track: Stealth FragComposer: Sonic Mayhem
Half-Life 2 OST — Calabi-Yau Model (Extended) System Overlord 2018-08-31 | Game: Half-Life 2Track: Calabi-Yau ModelComposer: Kelly Bailey
Half-Life 2 OST — Hard Fought (Extended) System Overlord 2018-08-29 | Game: Half-Life 2Track: Hard FoughtComposer: Kelly Bailey
Half-Life 2 OST — Hard Fought (Beta) [Extended] System Overlord 2018-08-24 | Game: Half-Life 2Track: Hard Fought (Short v.1, Beta)Composer: Kelly Bailey
Team Fortress 2 OST — BLU & RED Triumphs (Extended Mashup) System Overlord 2018-08-17 | Game: Team Fortress 2Tracks: BLU Triumphs! & RED Triumphs!Composer: Valve Studio OrchestraRemastered and extended version of youtube.com/watch?v=_k2l6Oorxs0
Half-Life 2: Episode One OST — Disrupted Original (Extended) System Overlord 2018-08-16 | Game: Half-Life 2: Episode OneTrack: Disrupted OriginalComposer: Kelly Bailey
Counter-Strike: Condition Zero OST — Main Theme (Extended) System Overlord 2018-08-16 | Game: Counter-Strike: Condition ZeroTrack: Main ThemeComposer: Zak Belica
Counter-Strike OST — Main Theme (Extended) System Overlord 2018-08-09 | Game: Counter-StrikeTrack: Main Theme(Counterstrike: Condition Zero)Composer: Zak Belica
Team Fortress 2 OST — The Art of War (Extended) System Overlord 2018-06-29 | Game: Team Fortress 2Track: The Art of WarComposer: Mike Morasky
Portal 2 OST — Robots FTW (Extended) System Overlord 2018-06-25 | Game: Portal 2Track: Robots FTWComposer: Mike Morasky
Portal OST — 4000 Degrees Kelvin (Extended) System Overlord 2018-06-22 | Game: PortalTrack: 4000 Degrees KelvinComposer: Mike Morasky
Half-Life 2 OST — LG Orbifold (Extended) System Overlord 2018-06-16 | Game: Half-Life 2Track: LG OrbifoldComposer: Kelly BaileyExtended version.
Half-Life 2 OST — Triage at Dawn (Extended) System Overlord 2018-06-08 | Game: Half-Life 2Track: Triage at DawnComposer: Kelly BaileyExtended version.
Half-Life 2 OST — Youre Not Supposed to Be Here (Extended) System Overlord 2018-06-03 | Game: Half-Life 2Track: You're Not Supposed to Be HereComposer: Kelly BaileyExtended original version.
