[14] 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).

[14] 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 track "Brainfreeze", for example.

Klepacki next composed instrumental pieces for Command & Conquer, drawing influences from orchestral, house, heavy metal, and hip hop music.

"[14] 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.

He took breaks from working to make cameo appearances as a Soviet soldier killed by Kane and an Allied commander in the cut scenes of Red Alert.

"[23] As of 2005, Red Alert was listed in the Guinness Book of World Records for selling several million units, bringing Klepacki his widest audience.

An avid Star Wars fan, he enjoyed scoring cut scenes featuring James Earl Jones, the voice of Darth Vader.

[27] With the expansion pack Firestorm, he attempted to "set things right" by writing more upbeat songs and including "Stomp", which would also appear in Command & Conquer: Renegade.

"[15] Several Command & Conquer mainstays appear as reworked versions, including "Target (Mechanical Man)", "Industrial", "Act on Instinct" and "No Mercy".

[35] A die-hard fan of the Star Wars franchise, Klepacki enjoyed complementing John Williams's style as he worked with sound effects used in the feature films.

[16] As a perk of composing, he visited the Skywalker Ranch and Industrial Light and Magic, and took pride in having his name associated with an official Star Wars product.

[36][37] For the Forces of Corruption expansion pack, he took greater creative liberty with the Star Wars feel by writing an original theme for the new criminal faction.

In line with the criminal theme of the game, Klepacki borrowed motifs and recreated the mood from scenes involving Jabba the Hutt in Return of the Jedi.

[5][6] Electronic Arts hired Steve Jablonsky to score the game instead;[41] an EA community manager at C&C 3's forums suggested that the audio team studied Klepacki's music and tried to recreate his style.

[45] He was interviewed about the creative process on 27 March 2007 by Kevin Yu, a Petroglyph community manager, and provided a detailed tour of his studio at the company.

"[45][46] Klepacki summarized the game's main styles shortly before release: For the Hierarchy—our evil alien race—I went with a more heavy-metal rock influence, to go along with how they stomp all over everything on the map with their massive walker units.

For our third faction, the Masari—our ancient star-faring side—I provided an epic orchestral feel, with worldly influences to reflect their godlike nature and questionable links to our past.

[45] Since Hierarchy heroes needed to communicate to the player in English, Klepacki engineered dialogue to seem as if the aliens were "telepathically speaking to you, with a back-masking effect on their voices...as if the words are being channeled straight to your brain".

Lastly, he drew on weather and other natural sounds for the Masari, describing their ambience as having "more weight, thunder, heavy bass rumblings, vortex gusts..."[45] Klepacki directed the voice-acting to have a "noble and strong" feel without appearing typically medieval or overly dramatic.

Klepacki composed the album's title track while working on Command & Conquer: Renegade, and feels the game's style is visibly present in Morphscape.

[59] Klepacki sought out specific samples and instruments used in the Command & Conquer soundtrack for use in the release; the title "Rocktronic" was an attempt to name his style of music.

[6] Around this time, he made it to the district finals of the Guitar Center "drum-off" competition after winning two store challenges in Las Vegas but was eliminated.

[20] The city's Las Vegas Weekly honored him as a "badass composer" in its mid-April 2009 issue, highlighting his prolific fan-base and work as producer for various local bands.

"[13] Klepacki listed several influences for his style of composition: "John Williams naturally for my love of Star Wars and his style in general, Michael Kamen for his composing diversity, Metallica for sparking my metal influence, Vince Dicola who in my opinion is way under-rated for his great work, Sly & The Family Stone for inspiring funk, syncopation, and positive energy, Larry Graham for inspiring me to play funk bass, Nine Inch Nails for their unique uses of mangled sound, and Rob Zombie for combining music with a theme and persona.

He notes that complex and quality music comes at a higher cost, prompting certain producers to simply "get somebody who could cop the Hollywood sound" instead of nurturing original style.

[16] Concerning his solo career and Westwood, Klepacki regrets "not having attended more of the fun company functions and parties while I was instead playing club gigs with bands with the mentality of trying to get signed or discovered.

"[13] When asked to reflect on his career, he replied: The ironic thing is that my original goal in life was to be in a famous band, tour the world and sell millions of albums.

Scathingly critical of the recording industry, he blames MTV—described as a "teenage reality show channel"—for putting a pretty face on music and destroying the independent valuation of actual sound.

[30] Holding that compact discs are "just too damn expensive", Klepacki believes that a few dollars' reduction in price would "deter people from downloading for free.

[30] His favorite artists by decade, starting with the 1960s, are Sly and the Family Stone, Graham Central Station, Metallica, Home Cookin', and Bob Schneider.