Hello! I’m Jeff Thomassen, a musician, songwriter, instrumentalist, and composer. I’m originally from Denver, Colorado and currently based in Brooklyn, NY. 

I’ve been a musician since I was 10 years old and have been in many orchestras, rock bands, ensembles, and experimental music groups. I’ve written and produced a lot of my own music, professionally under the moniker Tomas Sen. 

I attended the University of Colorado Denver for audio production and music business, and there I attended many courses such as piano and guitar performance, songwriting and composition, and audio production. The first few songs featured here are my projects while attending school. 

Many of the other songs are songs ranging from unfinished demos to professional works, such as the indie video game music. 

Hope you enjoy!

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