In 1986 I made six programmes about The Mysterious Art of the Conductor for the BBC's World Service. These derived from Interviews with nine conductors, among them Pierre Boulez, Colin Davis, Bernard Haitink and Charles Mackerras. Each programme lasted half-an-hour and included music examples. The interviews were much longer, but each was filleted and spliced so as to juxtapose – and sometimes contrast – the views of different conductors on particular aspects of their art. The interview with Pierre Boulez, reproduced here in full, was recorded in Broadcasting House on 25 October 1986. It gave me special pleasure and is, I believe, of special interest.