Imperfect Harmony is a film about musical control, explored through a clash between two maestros: avant-garde rebel and Holland's best-known composer, Louis Andriessen, and chief conductor at Amsterdam's Royal Concertgebouw Orchestra, Mariss Jansons. Half a century ago Andriessen vowed he would never compose for a symphony orchestra again. But, against all the odds and after much deliberation, he has agreed to do so. The occasion is the Concertgebouw Orchestra's 125th jubilee year concert and the commission is a present from the Concertgebouw to the orchestra.