O3 comprises Ingar Zach, percussion, Esteban Algora, accordion, Alessandra Rombolá, flutes and cheramic objects.

Three musicians from three countries (Norway, Spain, Italy) three well-defined languages, each with its significant individuality.

The members of O3 shares a taste for a language full of detail where the weight of each sound-silence-noise is measured with care, to shape musical structures with identity. The work of O3 has been defined as "chamber music": all three have a long history of collaboration with chamber groups particularly relevant to contemporary, electronic and improvised music. O3 has played in Spain and France and has been chosen as the only group in Madrid for collaboration with the renowned Merce Cunningham Dance Company in May 2009.