
The music for this expansion is apocalyptic and dystopian, just like in the first Starcraft and Wings of Liberty, with the occasional breakthrough of hopeful music that foreshadows the story arc.
Additional files that were not released as part of the expansion's OST but are often used inside the game help reflect the attitude of the campaign. Gentlemen, welcome to the Heart Of The Swarm. Terran Up The Night, one of the credits songs has to be the anthem of the Humans Are Warriors trope. The short and sweet campaign victory theme. And even the main menu music, a superb redux of the original game's main menu theme. And the Protoss themes, with their mix of tribal and ethereal/otherworldly elements (and occasional snippets of their themes from the first game). And the Zerg themes, eerie and unease-inspiring - nightmarish, some may say (and yes, regarding the comment in the first game's section above, Zerg music does indeed become more awesome with lots of drums). Especially the Terran themes, which combine violin, string guitar, drums, and electric guitar to make wonders. Ah, hell, let's just say ALL the music in StarCraft II WoL. Bonus points for this track for having a brief reprise of Tassadar's sacrifice at 3:30, and a reprise of the background music of DuGalle's suicide at 5:12.
As does the choir-tastic, Rousing Speech-emboldened "Fire and Fury".Though the title music, "Wings of Liberty" gives it a run for its money.
The game has lots of really good music, but "Card to Play" is the pinnacle.Card To Play plays over the Terran assault on Char, and perfectly captures both the terror and awe of a war against the Zerg Swarm.