‘Duo’ is a set of variations on the twisting melody introduced by the violin at the beginning. A short ricochet motif soon appears, completely unexpectedly, disrupting the flow of the music. This interjection returns over and over, spurring the work on into the allegro section where it infects the melody and appears as the repeated note motif. Gradually the music accelerates until the new motif is almost as fast as the original ricochet. At this point the ricochet is revealed in its original form and the piece shudders to a grinding halt. ‘Duo’ is the second piece Harris has written for Rolf and Helena, following Wayleggo which was given to them by the composer as a wedding present.