Hi! I'm Matthijs Koster,
a composer and sound designer
from Haarlem (NL)

Castle Away
Work

Projects

Matthijs Koster
About

Sound as language,
music as experience.

I'm Matthijs Koster, composer and sound designer based in Haarlem. Since 2016 I've been making music and sound for film, games, advertising, podcasts and museums. From intimate ambient soundscapes to immersive 3D audio installations. I like music that makes you wonder how it got there.

Brands I worked for
Independer PostNL Heineken NLZIET Carré Kwantum Oranje Fonds BrandMR
Get in touch

What I do

🎵

Composing

Music for film, games, exhibitions and brand campaigns. From intimate ambient landscapes to full electronic arrangements.

More about me
🍃

Sound Design

Sound design for branded content, games and interactive installations. Including 3D audio and spatial sound for immersive museum productions.

More about me
🎮

Games

In 2024, I started making music and sound design for games. Together with a Adriaan, Sim, Franz and Professional Panda we created Rift Riff which got nominated for the Dutch Game Awards 2025 in four categories (including Audio).

View Rift Riff
🎛️

MOST

My studio in Amsterdam. MOST is a sound boutique for audio post and original soundtracks, run together with Ivo Witteveen.

Go to MOST
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Nachtvocht

Nachtvocht is an electrifying fusion of two artistic worlds, blending visuals by Pepijn Borgwat with my music to create an electronic experiment filled with unexpected twists, a journey through the night where energy literally drips from every moment.

Go to Nachtvocht
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DJ

Beyond music production, I also have a passion for DJing. For many years, I served as an in-house DJ at Patronaat Haarlem, a role that led to the creation of my guilty pleasure DJ team: Natte Sokken.

Go to Natte Sokken