The title Dialogues and Contrasts describes the nature of the exchange which takes place between the performer and the materials committed to tape. In the first movement the exchange is more in the nature of an argument. Though initially each side appears to favor an independent thematic course, as the movement progresses the performers engage in direct response to the statements on tape. The second movement is more subdued and reflective, with many solo passages, particularly from the French horn. Tape joins from time to time with its own version of the fragmented melodic lines. In the last movement it appears as if the instruments and tape each decided to go their own way…