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Review: It's been a long time since Halo: Combat Evolved revolutionised the word of first-person shooter video games. Graphically superior to anything that had come before it, the franchise also benefits from a spectacularly gripping storyline in which humans are outgunned and out-teched by a ruthless and uncompromising alliance of superiorly equipped alien races united as The Covenant. The titular Halo adds a kind of Prometheus air of uncertainty, as nobody really knows what it does until attempts to activate the galaxy-destroying weapon reveal something worse than death - a parasitic breed called the Flood. If all that was enough to blow everyone away in 2001, 2004 brought us to a whole new level of immersion in this future scape. Just like its predecessor, a big part of the impact was the visionary score by gaming soundtrack masters Martin O'Donnell and Michael Savatori. Now here it is in all its Gregorian chanting glory.