The Dutch bass, Martijn de Graaf Bierbrauwer, began singing with the Koor Nieuwe Muziek. He made a number of years with the Schola Cantorum Amsterdam, with which he sang at the Festival Oude Muziek (Early Music Festival) and the Festival van Watou. Currently, he is part of the Nederlandse Bachvereniging and Cappella Amsterdam. He also sings regularly with the Nederlands Kamerkoor and the Groot Omroepkoor (Netherlands Radio Choir), and he belongs to Frommermann.