As expected of Intelligent Systems, Code Name S.T.E.A.M. has an absolutely stunning soundtrack composed by Yoshito Sekigawa, full of thrilling and blood-pumping songs that just make you want to scream "AMERICA! FUCK YEAH!"
- Lady Liberty, the theme of the main menu and the soundtrack to all of your battle preparations, just screams "Saddle up, boys and girls! Time to kick some alien ass!"
- All of the battle themes are great in their own way, but the real standout pieces are:
- Trouble Brewing II and III, which, on top of being awesome, also harkens back to the style of another Intelligent Systems game with awesome music, Advance Wars: Days of Ruin. "Trouble Brewing II" got a new remix for Super Smash Bros. Ultimate.
- Intersection: Me Vs You, with its use of a combination of electric guitar and a hammering, dancing piano.
- And last but not least, Deadly Dance II, major contender for best song in the game. Intense, badass, and hauntingly beautiful. Of course, the more mellow Deadly Dance I is a beautiful lead-in before things start getting serious.
- But the enemy phase themes are no slouch either, and they make the decision to use dubstep to represent eldritch alien menaces seem blindingly obvious. Under The Surface II and III, as well as He Who Laughs Last II and III and Vortex Of Night, all let you know you're fucked on the enemy phase.
- The Final Battle theme against Starface, Blessings, is absolutely gorgeous, and totally suits humanity's one and only chance to prevent the extinction of all life on earth.
- One of the many songs in the ending credits, Agents Of Steam, is absolutely badass.