From Halopedia, the Halo wiki
Halo: Combat Evolved Anniversary: Original Soundtrack
Martin O'Donnell and Michael Salvatori (adapted by Brian Trifon, Lennie Moore, Paul Lipson, and Tom Salta)
Heretic Machine is the thirty-sixth track (Disc 2 Track 19) in Halo: Combat Evolved Anniversary: Original Soundtrack.
The track is an arrangement of Tron, an unreleased track from Halo: Combat Evolved and its offical soundtrack.