Despite its comical premise and appearance, The Battle Cats boasts a surprisingly large repertoire of fantastic music, some of which will leave one wondering if they're even playing the same game anymore.
- "The Invasion Begins"
, which plays while the conquest of the Battle Cats is being explained, does a pretty good job of making an army of adorable cats actually seen threatening. - The main battle theme "Invading Japan! is a relaxing, jazzy marching song that's perfect for invading Japan (or some other poor country). It also serves as the recurring Leitmotif of the entire game itself.
- On the opposite side of the spectrum, "Slow Battle" is an impossibly chill synthesizer remix of the main battle theme that makes you wonder if you're fighting or lounging.
- "The Fierce Ones Who Shake the Earth" is peppy, stylish, and has a few suspenseful parts, fitting the long, dangerous stages where it tends to play.
- "The Great Tribal March" is considerably slower and less upbeat than the others, being a percussion-heavy piece with tribal-sounding instruments, but just because it's relaxed does not mean the level will be any easier.
- "Naniwa's Lover", better known as the rush theme, is a faster-paced remix of the main battle theme that embodies the "Oh, Crap!" feeling when a new boss enemy you were not prepared for appears and delivers a Curb-Stomp Battle to all your cats.
- "The Battle of Iriomote" that plays on the Moon levels and some other harder levels. Grandiose strings backed up by an arsenal of xylophones and wind instruments emphasizes the finality of the Moons and their lethal bosses.
- "Challenge Battle", an upbeat synth song perfect for charging the enemy base of the Challenge Stage with your Cat army (whether or not you're prepared enough).
- "Ending Party" from the creditsnote gives a genuinely emotional feeling of nostalgia and completion that would not be expected from such a comedic game.
- "To the Unknown World", the normal battle theme of Into the Future, is an upbeat, high-energy song using futuristic synthesizers backed by occasional horns, it makes rushing the enemy base with a horde of powered-up cats even more satisfying. Its own "rush" theme, "Invaders of the Future", is a catchy, fast trumpet piece.
- "Apollo Showdown", the theme of Into the Future's Moon bosses is possibly the most suspenseful song in the game. A grandiose symphony of strings and trumpets backed by synthesizers and booming percussion embodies the scale and difficulty of these otherworldly bosses.
- "God's Descent", the theme that used to play during the boss battles against the Crazed/Manic Cats, the Cyclones, and the advent bosses, a slightly modified variation of Carl Orff's "O Fortuna". The Ominous Latin Chanting really emphasizes the power of the bosses and how much of a mistake it was to challenge them. With the 10.7 update came a new version to replace the original thanks to copyright business, and thankfully it's just as powerful and imposing as its predecessor.
- "Gamatoto Expedition♪" is full of derpy innocence and charm.
- "Dojo Time" is an amazingly energetic reprise of the main theme that emphasizes the time trial nature of the Catclaw Dojo.
- The Annihilation City collab event brought with it this electro-dubstep remix of the main theme, and it is amazing. It also includes another remix of the main theme that incorporates Ominous Latin Chanting alongside a wicked electric guitar solo, turning this once-relaxing level theme into awesome boss music.
- Cats of the Cosmos got "Romantic Spaceflight", an incredibly funky techno remix of "Invading Japan!" which trades the traditional instruments for electronic sounds, with ear-satisfying results. The alternate theme "Hero of the Galaxy" is worth a mention too, being a high-energy, cheerful, and fast-paced electronic piece.
- "Surprise Attack! Unidentified Lifeforms", which plays whenever a high-level boss shows up in Space. Incredibly high-energy and catchy yet intense enough to tell you that these enemies mean business, it sounds like something straight out of a space battle video game.
- The final level of Cats of the Cosmos brings us the "Big Bang Suite". This grandiose, impossibly suspenseful theme wouldn't be out of place in a JRPG or an Anime, and the fact that it plays in The Battle Cats of all things makes it all the more awesome.
- Filibuster Obstructa, the Optional Boss of Cats of the Cosmos, comes with a dramatic battle theme which really gives the impression of a decisive battle against a reality-ending menace. As an added bonus, the looped segment of the song is roughly as long as Filibuster's attack animation, meaning that if you've heard it in its entirety and Filibuster hasn't been knocked back, it may as well be a death knell.
- The theme that plays during the Powerpro Baseball Collab is blood-pumpingly energetic and rousing.
- All five songs from the Evangelion Collab, homages to pieces from the original series, ooze with the same intensity and magnificence as the songs they were derived from. And then we got a visual remake of the original OP along with Yoko Takahashi herself replacing all the original lyrics with nyaas. It's either the most awesome or the funniest song ever.
- The final level of Stories of Legend, Eldritch Forces, brings us "Ancient Power" a grand, orchestral remix of the original Moon Theme. It encapsulates the feeling of fighting the Final Boss of the gargantuan Stories of Legend, Mecha-Bun, and is sure to make anyone nostalgic for the first time they took down the Final Boss of Empire of Cats.
- Uncanny Legends brings "Ancient Curse", another, more traditional-styled but no less intense remix of the Moon theme, perfect for the ancient beasts that you'll fighting in the Uncanny Legends.
- "Astonishing! Ancient Lifeforms", the theme of the Uncanny Legends stages, is very tribal-sounding, with booming percussion and traditional-sounding instruments giving it an ancient and menacing aura.
- Master Uril, the Final Boss of the Heavenly Tower on Floor 50, comes with a climactic, intense battle theme that conveys the feeling of finality.
- The Aku Realms theme, a cartoonish yet evil-sounding battle theme that fits the Aku enemies perfectly.
- Jagando's boss theme has the orchestra and ominous chanting that comes with any Lord of Ruin, creating a climactic theme for the finale of the Aku Realms.
- The theme for the Kunio-kun collab is a bombastic arcade-style remix of the now memetic Csikos Post by Hermann Necke.
- All three themes of the Behemoth Culling stages encapsulate the feeling of delving into the respective harsh environments and hunting down the dangerous Behemoths: the mysterious flutes and xylophone of the Hidden Forest of Gapra, the desolate instrumentation of Ashvini Desert, and the pounding drums and brass of Jinfore Volcano.
- Zero Luza's boss theme is incredibly menacing and primal-sounding, with growling bass alongside a dramatic violin and booming percussion. Regardless of whether you try to quickly rush down Zero Luza or wear him down over the course of a long fight, it's a fitting theme for the stage.
- The Underground Labyrinth has the exploration theme, a mysterious song reminiscent of exploring a dungeon in a JRPG, while the boss theme sounds like encountering a sudden battle in said JRPG.
- Zero Legends, being representative of a fractured reality where anything is fair game, brings a repertoire of funky remixes of the existing battle themes:
- Upon stepping into the second subchapter of Zero Legends, you're introduced with this remix of the main battle theme, whose funky and all-over-the-place instruments and sounds reflects the Legend Saga that starts bringing all different kinds of enemies from all corners of the game, even the various Final Bosses, Optional Bosses, and Super Bosses of the game, for you to fight once more.
- Later stages bring a similar rendition of "The Great Tribal March", which maintains the groovy beat of the original while updating it with funky synthesizers and other out-there instruments, creating a bizarre-sounding yet incredibly catchy level theme.
- Similarly, Zero Legends's remix of "The Fierce Ones Who Shake the Earth" combines the fast, driving melodies of the original track with house music-style instruments to give it a totally new feel.
- Zero Legends also gets its own rendition of the EoC Moon theme, used for the rematches with the Legend bosses. The dramatic, yet tragic-sounding EoC Moon melody at the beginning gives way to a grandiose and imposing original section, which gets more suspenseful and dangerous-sounding as it proceeds.
- Upon stepping into the second subchapter of Zero Legends, you're introduced with this remix of the main battle theme
- The new bosses of Zero Legends have their own theme, a magnificent orchestra theme that seamlessly blends motifs from "Invading Japan!", "The Battle of Iriomote", and "The Great Tribal March" along with original sections, creating a theme worthy of a battle with mysterious beings at the edge of a crumbling reality.
