ONCEIM is a 25 people orchestra leaded by Frédéric Blondy that explores the possibilties of contemporary composition and improvisation and their intereaction on a large scale. Since 2012 the orchestra has performed several pieces written by Stephen O'Malley, Eliane Radigue, Jérome Noetinger, Arnaud Rivière, Bertrand Denzler, Pierre-Antoine Badaroux, Frédéric Blondy, Sebastien Beliah among others and has performed their own improvisations.