In 1994, Klepacki met with Westwood Studios developers to discuss the soundtrack of the company's next project—"Command & Conquer". To define the game's style, Klepacki listened to a number of bands, including Nine Inch Nails and Ministry, which would supply the iconic industrial style found in the majority of the songs. He combined various elements of this music and added his own touch to create a unique sound. With the company's recent shift to 22 kHz audio, Klepacki composed with an ASR-10 sampler, a Roland S760 sampler, a Roland JD 990 synth module, and an electric guitar. The first few songs he composed for "Command & Conquer" contained voice samples—including the notable pieces "Act on Instinct" and "No Mercy" (which featured wild declarations from "Bill & Ted's Bogus Journey"). The samples were later found to interfere with the game's spoken audio, and were replaced with versions lacking the voices, although the original versions (and several other unused pieces) can still be found on the DOS "C&C" and "Covert Operations" discs. Complete versions of the songs later appeared on the game's commercial soundtrack. He would continue to sample clips from film and other media throughout his career, using a quote from "The Brain from Planet Arous" in the "Yuri's Revenge" soundtrack "Brainfreeze", for example. Klepacki next composed instrumental pieces for "Command & Conquer", drawing influences from orchestral, house, heavy metal, and hip hop music. For the credits, Klepacki wrote "Airstrike", featuring a hook later used in "" for the Global Defense Initiative. Conversely, the Brotherhood of Nod ending used the song "Destructible Times" written by Klepacki's local band, I AM. Developers requested the song because it "reflected the war aspect and bad-ass vibe of Nod's side." The "C&C" expansion pack "The Covert Operations" featured seven new ambient pieces, all of which were also included on the disc in high quality CD Audio format. Though the soundtrack was not released through retail, Westwood sold it by special order through its website and in game catalogues.