This duo is one of several serial compositions I was wrote in the late sixties early seventies. This was the standard 'academic' style and several professors of music then wrote 'how to do' books on serial composition. Retrospectively it was not as good an idea as it seemed at the time, but some of the pieces can be fun to play. There are not many playable atonal recorder pieces available so hopefully someone will find this a useful addition to their repertoire.