All audible and inaudible sounds in the universe are an inspiration for my music, such as physical movement, art, architecture, good food, electronics, quantum physics and nature.

My focus is on experimental, improvisational and contemporary music. I’ve been a member of groups like The Electric Aardvark, where we worked a lot with electronics, or Field of Ears, where filmmakers are involved.

As an improviser I’ve made recordings and/or performed at festivals with Michael Moore, John Butcher, Joost Buis, Ken Vandermark, Paul Dunmall, Xavier Charles, Han Bennink, Francoise Rivalland, Hamid Drake, Fred Frith, Hilary Jeffery, Tewolde Brhane Girmay, Franz Hautzinger, John Tilbury.

2019 Dromedary, a duo with Trombone player and composer Hilary Jeffery. Having worked together for more than 12 years in many projects, Hilary and Rozemarie formed Dromedary in November 2019 to play improvised modal music. Key themes for their work include consciousness, inner-space, tuning, expanded listening, presence and multi-dimensionality.

Since 2008 I am part of the pool of musicians of Lysn, a band formed and led by trombonist Hilary Jeffery. The band has a variable line-up, he describes the music as "improvised drone-jazz for inner/outer space”.

2007 to 2011 Oliver & Heggen, a duo with violinist/violist Mary Oliver.


Hisako Horikawa and Rozemarie, Göteborg 2011
foto: Astrid Askberger

Cooperation with choreographers Marek Jason Isleib 2018, Hisako Horikawa 2003/2004 and 2011, Lily Kiara 2006 to 2010, Julyen Hamilton 2007, Magpie Music Dance Company 2005 to 2010, Sylvain Prunenec 2001 to 2003.

2002 to 2005 member of punk/rock/impro band The Ex with tours through Europe, USA, Canada and Ethiopia.

1997 to 2019 member of the Nieuw Ensemble with tours through China, Korea, USA and Europe. New Chinese music is this ensemble’s specialty.


Singing with nature and Marie Kaada Hovden, Skomvaer Island, Lofoten 2017
photo: Caroline Ho Bich-Tuyen Dang

I have worked in many orchestras and ensembles for contemporary music, such as the Royal Concertgebouw Orchestra, the Rotterdam Philharmonic Orchestra, the Radio Chamber Orchestra, Asko/Schönberg Ensemble.

During my studies I have been solo double bassist of the Youth Orchestra of the Netherlands, and of the Jeunesses Musicales World Youth Orchestra.

Double bass study at the Conservatory for Music in Maastricht, the Sweelinck Conservatory in Amsterdam, graduated from the Royal Conservatory in The Hague in 1990 as performing and teaching musician.

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