The killer app for the original Xbox (in its gigantic splendor). Microsoft was so desperate to have it that they bought Bungie outright.
Seriously.
Bungie originally announced Halo at MacWorld in 1999 (for both PC and Mac), and then, in 2000, Microsoft bought them.
Even if you can’t stand first-person shooters, you’ve got to hand it to Martin O’Donnell and Michael Salvatori; the main theme is excellent.
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