30. A process, as claimed in claim 27, wherein the pitched accompaniment notes have a first melodic contour and wherein the steps of modifying the parameter signals in response to a change in the defined root note and modifying the parameter signals in response to a change in the defined chord type each further comprise defining the second segment of music to have a second melodic contour different from the first melodic contour.
30. A process, as claimed in claim 27, wherein the pitched accompaniment notes have a first melodic contour and wherein the steps of modifying the parameter signals in response to a change in the defined root note and modifying the parameter signals in response to a change in the defined chord type each further comprise defining the second segment of music to have a second melodic contour different from the first melodic contour. 31. A process as claimed in claim 30, wherein the pitched accompaniment notes have a first rhythm pattern and wherein the steps of modifying the parameter signals in response to a change in the defined root note and modifying the parameter signals in response to a change in the defined chord type each further comprise defining the second segment of music to have a second rhythm pattern different from the first rhythm pattern.