Rebecca Blau is a member of various chamber music formations and is particularly interested in contemporary music. Her first experience with new music was in the Landesjugendensemble für Neue Musik Thüringen, which works closely with the composers' association Via Nova e.V. in Weimar. Since then she has performed as a member of various ensembles such as International Ensemble Modern Academy, Ensemble Musikfabrik, Ensemble Modern, Ensemble Scope at the Lucerne Festival, Warsaw Autumn Festival, Rainy Days Luxembourg and Festival de La Habana de Música Contemporánea in Cuba, as well as at Manifeste Paris, Fondation Royaumont and Mixtur Festival Barcelona.
In the 21/22 season Rebecca Blau was a member of the International Ensemble Modern Academy Frankfurt, with which she performed concerts at Manifeste Paris, Lucerne Festival, Time of Music Finland, Gaudeamus Muziekweek Utrecht and 180° Festival Sofia.
Together with the cellist Charlotte Lorenz Rebecca Blau is co-funder of the Lucerne based Dissolution Ensemble.