"At present...I feel that my works require a modified serial technique, but it is a very unorthodox one, and almost never strictly adhered to throughout a given work. Neither does it destroy all tonal feeling...I do not mean tonality, but I do stress a progressive direction from one "note" center to another...(twelve-tone music) seems to be overly static without providing that experience of forward or backward movement that is an essential part of our musical art."