[5] He and Mikael Balle became members of the demogroup Silents DK, and later started collaborating with a group of coders known as Crionics.

He then recorded the soundtrack of Hitman 2: Silent Assassin with 110 musicians of the Budapest Symphony Orchestra and Hungarian Radio Choir.

Kyd followed up with Hitman: Blood Money, also performed by the Budapest Symphony Orchestra and Hungarian Radio Choir.

Kyd sought to create a score that would fit a retro-futuristic setting, and avoided using orchestral elements and guitars, which were typically found in other Warhammer games.

The score was inspired by "cyberpunk culture and sci-fi manga," with the main instruments including drum machines and modular synths.

[11] Jesper Kyd's influences include composers such as Ottorino Respighi, Igor Stravinsky, Jean-Michel Jarre, Vangelis, Mike Oldfield, John Williams, Jerry Goldsmith, and bands such as Röyksopp, the Knife, Pink Floyd, and Underworld.