Trace Amounts

Trace Amounts is a song included in the Halo: Original Soundtrack. It plays in the Halo: Combat Evolved level The Library. This piece contains electronically generated sounds and a relatively slow tempo. The ominous tone reflects the library's dark past.

Trivia[]

The name "trace amounts" is a reference to the effects that the Flood has on an atmosphere, according to the monitor of Installation 04, 343 Guilty Spark. When scientists refer to the contents of an atmosphere they say, for example, 21% oxygen, 78% nitrogen, and "trace amounts" of other gases.

Music in the Halo series

Halo: CE Original Soundtrack

Opening Suite • Truth and Reconciliation Suite • Brothers in Arms • Enough Dead Heroes • Perilous Journey • A Walk in the Woods • Ambient Wonder • The Gun Pointed at the Head of the Universe • Trace Amounts • Under Cover of Night • What Once Was Lost • Lament for Pvt. Jenkins • Devils... Monsters... • Covenant Dance • Alien Corridors • Rock Anthem for Saving the World • The Maw • Drumrun • On a Pale Horse • Perchance to Dream • Library Suite • The Long Run • Suite Autumn • Shadows • Dust and Echoes • Halo • Siege of Madrigal

v d e Halo 2: Original Soundtrack

Volume 1	MJOLNIR Mix • Blow Me Away • Peril • Ghosts of Reach • 1st Movement of The Odyssey • Heretic, Hero • Flawed Legacy • Impend • Never Surrender • Ancient Machine • 2nd Movement of the Odyssey • In Amber Clad • The Last Spartan • Orbit of Glass • 3rd Movement of The Odyssey • Heavy Price Paid • Earth City • High Charity • 4th Movement of The Odyssey • Remembrance • Connected

Volume 2	Prologue • Cairo Suite • Mombasa Suite • Unyielding • Mausoleum Suite • Unforgotten • Delta Halo Suite • Sacred Icon Suite • Reclaimer • High Charity Suite • Epilogue

Halo 3: Original Soundtrack

Luck • Released • Infiltrate • Honorable Intentions • Last of the Brave • Brutes • Out of Shadow • To Kill a Demon • This is Our Land • This is the Hour • Dread Intrusion • Follow Our Brothers • Farthest Outpost • Behold a Pale Horse • Edge Closer • Three Gates • Black Tower • One Final Effort • Gravemind • Cortana Suite (No More Dead Heroes • Keep What You Steal) • Halo Reborn • Greatest Journey • Tribute • Roll Call • Wake Me When You Need Me • Legend • Choose Wisely • Movement • Never Forget • Finish the Fight • LvUrFR3NZ

v d e Halo Wars Original Soundtrack

Original Soundtrack	Spirit of Fire • Bad Here Day • Perspective • Money or Meteors • Flollo • Just Ad Nauseum • Unusually Quiet • Flip and Sizzle • Put the Lady Down • Six-Armed Robbing Suit • Action Figure Hands • Status Quo Show • Part of the Plan • Work Burns and Runaway Grunts • Freaked Out • Rescued Or Not • Best Guess At Best • One Problem at a Time • De Facto The Matter • Part of The Problem • Out of There Alive • Through Your Hoops • Under Your Hurdles • Insignificantia

DVD Exclusive Tracks	X-06 • Five Long Years • Nothing Ventured, Nothing Gained • Quite the Vacation Resort • We're Burning Sunshine

v d e Halo 3: ODST Original Soundtrack

Overture • The Rookie • More Than His Share • Deference for Darkness • The Menagerie • Asphalt and Ablution • Traffic Jam • Neon Night • The Office of Naval Intelligence • Bits and Pieces • Skyline • No Stone Unturned • One Way Ride • The Light at the End • Data Hive • Special Delivery • Finale

Halo Legends Original Soundtrack

Ghosts of Reach • Brothers in Arms • Truth and Reconciliation • Opening Suite 1 • Opening Suite 2 • Halo • Desperate Measures • Cairo Suite 1 • Delta Halo Suite • Machines and Might • Remembrance • Blade and Burden • Steel and Light • Impend • True Arbiter • The Maw • Unforgotten • Shattered Legacy • Out of Darkness • High Charity Suite 2 • Into Light • Sacred Icon Suite 2 • Rescue Mission • The Last Spartan • High Charity Quartet • Here in Peril • Earth City • Risk and Reward • Exit Window • Finale 2

v d e Halo: Reach Original Soundtrack

Overture • Winter Contingency • ONI: Sword Base • Nightfall • Tip of the Spear • Long Night of Solace • Exodus • New Alexandria • The Package • The Pillar of Autumn • Epilogue • From the Vault • Ashes • Fortress • We're Not Going Anywhere • At Any Cost • Both Ways • Walking Away • Ghosts and Glass • We Remember

Halo: Combat Evolved Anniversary Original Soundtrack

Random Slipspace Trajectory • Bravery, Brotherhood • Installation 04 • An End of Dying • Pale Rider • Yawning Chasm • A Private Service • Rock in a Hard Place • Flotsam, Jetsam • Captain, My Captain • Suite Fall • Demons and Heretics • Exfiltration • Honest Negotiation Suite • Unless You Mean to Shoot • Infiltration • Strung • Still, Moving • Lions and Tigers and... • Between Beams • Paranoid Illusion • Xenoarchaeology • Choreographite • In the Substance of it • How to Get Ahead in War • Unreliable Exploration • Dewy Decimate • First Step • Aborea Above • Bad Dream • Cloaked in Blackness • Strident • To Sleep • Marathon Sprint • Fragments • Heretic Machine • Unfortunate Discovery • Heliopause • Didactic Principle

v d e Halo 4: Forward Unto Dawn Original Soundtrack

Sphere • Cryo • Reflections • C.A.M.S • Sleep • 4AM • Volcano • Paratus • Flag • Secrets • Classified • Decisions • Leaving • Invasion • Locker • Survivors • Sniper • Warthog • K.I.A. • Axios • Forward

v d e Halo 4: Original Soundtrack

Vol. 1	Awakening • Belly of the Beast • Requiem • Legacy • Faithless • Haven • Nemesis • Ascendancy • Solace • To Galaxy • Immaterial • 117 • Arrival • Revival • Green and Blue

Vol. 2	Atonement • Gravity • Wreckage • Aliens • Kantele Bow • Pylons • Escape • Swamp • Push Through • Convoy • To Galaxy (Extended) • Lasky's Theme • Foreshadow • Cloud City • This Armour • Intruders • Mantis • Sacrifice • Never Forget (Midnight Version) • Majestic

Halo: Spartan Assault Original Soundtrack

Legacy • Stark • Who's There? • Bridge Too Far • Hunted • Ready or Not • Wolverines Return • Rising • Survive • Prelude • Breaking the Code • The Big Guns • Quiet Giant • Guns in the Dark • Epic Evolution • Eliminate the Resistance • Night Dreams • Wolverines Reborn • Regret • Castle Defense • Simple Mystery • Intimate • Onslaught • Elevated • Knock Knock • Night Guards • Finishing the Fight

Halo 2: Anniversary Original Soundtrack

Halo Theme Gungnir Mix • Skyline • Not a Number • Kilindini Harbour • Only a Star, Only the Sea • A Spartan Rises • Unforgotten Memories • Second Prelude • This Glittering Band • Jeopardy • Halo Theme Scorpion Mix • Punishment • Promise the Girl • Unsullied Memory • Arise in Valor • Unwearied Heart • Spartan's Regret • Genesong • Breaking the Covenant • Follow in Flight • Cryptic Whisper • Impart • Charity's Irony • Moon Over Mombasa • Trapped in Amber • Builder's Legacy • Moon Over Mombasa, Pt. 2 • Librarian's Gift • Zealous Champion • Steward, Shepherd, Lonely Soul • Africa Suite • Prophet Suite • Into the Belly of the Beast • Cracked Legend • Menace No More

Halo: Spartan Strike Original Soundtrack

Spartan Strike • With Her Whisper • Mombasa Arrival • In the Clear • Epic Evolution Reborn • Just Beyond • The Time to Ride • Go Silently Within • Plan of Attack • Homeworld Bound • Stalking Prey • Legacy Unbound • New Foe • The Canopy for Cover • Hush Now Rush Now • Careful Steps • Next Move • Origin and Time • Into the Depths • Perpetual Motion • Bring a Bigger Gun • Attack • Rapid Recon • Native Tongue • Force Multiplyer • Jungle Threats

Halo 5: Guardians Original Soundtrack

Halo Canticles • Light is Green • Kamchatka • Return to the Fold • Rock and Ice • Argent Moon • Scavengers • In Absentia • Meridian Crossing • Unearthed • Unconfirmed Reports • Keeper of Secrets • Cavalier • Crossed Paths • Untethered • Skeleton Crew • Siren Song • Enemy of my Enemy • Honor's Song • Warrior World • Covenant Prayers • Cloud Chariot • Sentry Battle • Worldquake • Advent • Walk Softly • Genesis • Dominion • The Trials • Sentinel Song • Crypt • End Game • Reunion • Blue Team • Jameson Locke • Osiris Suite, Act 1 • Osiris Suite, Act 2 • Osiris Suite, Act 3 • Osiris Suite, Act 4

Halo Wars 2: Original Soundtrack

Recommissioned • Barren • Isabel's Awakening • Antediluvian • Amethyst • Arise, Goodbye • Symbiotic • The Banishing • Run Little Demons • It's Done • Bon Voyage, Bon Chance • Empathy • Infamy • Heads Up Display • Steel Hands, Gloves Off • Abolition • Catastrophic Failure • Demonslayer • Excision • Inscision • Non-Euclidean • Cratered • Scorched Earth • Simulacra • Tactical Error • Strategic Feint • Gambit • Calculated Risk • Collateral Harm • Fog of War • Battle Aspect • Singular Vision • Pinch Maneuver • Last Stand • Energy Efficient • Dug In • Bivouacked • Legitimate Strategy

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