He walks down the stairs of his student apartment above café Merlijn on Meeuwerderweg in Groningen on July 2. Once outside, he gets on his bicycle. A few hundred meters north toward downtown, he passes the Prince Claus Conservatory where he trained to be both a horn player and a conductor. Then he crosses the Tromp Bridge and then pedals down Oosterstraat to the Martini Church. Inside, he meets the accordionist, the horn player, the pianist, the clarinetist, the timpanist and the string quintet of Camerata RCO....