The fact that Arthas's Theme by Glenn Stafford existed this whole time and wasn't on the official release is criminal. This unreleased Warcraft III collection pulls together character themes and cinematic cues that the composers wrote but never formally released.
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Derek Duke's Illidan's Theme and Lich King Theme are both standouts, each one nailing the personality of characters that would define Warcraft for decades. Tracy W. Bush's Tragic Confrontation carries this weight that hits different when you know where the story goes.
Sad Mystery is quieter, more restrained, almost fragile. Comradeship has warmth the main soundtrack rarely shows. These aren't B-sides or scraps, they're fully realized compositions that just never got a proper home. If WC3's story meant anything to you, you need these tracks.