I'm not sure if this is old news, but I couldn't find in relation to this online so I thought I'd share it anyway.
This evening I stumbled upon this classic tune from Bungie's "Myth" series which was once titled "The Siege of Madrigal", which then later appeared as an Easter Egg in the "Halo" series under a new title, "Spartan's Regret".
Nice to see the tradition of this tune being carried on.
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It was still titled The Siege of Madrigal in Halo and on the soundtrack, never heard it called Spartans Regret before.