Marijke van Klaveren, conductor of the Voorburgs Vocal Ensemble, and Gilles Michels, conductor of Con Passione, studied together in Rotterdam under Barend Schuurman. Like Marijke, Gilles has extensive experience of working with children and young people. The two conductors occasionally meet as colleagues and are looking forward to working together. A collaboration between two chamber choirs offers the chance to perform works that require larger-scale steeing.  Rachmaninoff's Liturgy of St. Chrysostom works best with a full, warm choral sound, evoking associations with vast northern vistas,…