From Halopedia, the Halo wiki
Album:
Halo 2: Anniversary Original Soundtrack
Composer(s):
Martin O'Donnell and Michael Salvatori
Length:
0:34
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Unwearied Heart
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Genesong
Spartan's Regret is the seventeenth track included in the first disc of the Halo 2: Anniversary Original Soundtrack. It is the remastered version of Siege of Madrigal from the Halo: Original Soundtrack, albeit without the vocal reprise.