Haukur Tómasson’s 'Reaction' (2006) for accordion and cello explores a rich tapestry of instrumental dialogue. Originally written for accordion and double bass, this reworked piece highlights Tómasson’s fusion of traditional and contemporary styles. From tentative exchanges to energetic unisons, 'Reaction' unfolds through diverse moods and textures, with the accordion often functioning as an “artificial overtone machine” for the cello. Recorded by EKKI MINNA, the piece showcases Tómasson’s ability to blend tradition with innovation, presenting a distinctive voice in contemporary chamber music.