 The world première of "Mikrophonie II" took place on 11 June 1965 in a Musik der Zeit concert at the Große Sendesaal of WDR in Cologne.The score is dedicated to Judith Frehm (Pisar).Two recorded performances of "Mikrophonie I" by the Stockhausen ensemble have been released, but only one of "Mikrophonie II", though the two compositions have always appeared together, on different labels and in different formats.