„Then M. Ravel discussed another idea. That was that in these days of cacophony it might be quite an original idea for the orchestra to start, say, in C major, and then, through a series of discords the instruments should divide, some going up a semitone at every three or four bars, while others went down in the same way, eventually ending in perfect harmony in C major two octaves apart. He said: 'It is just an idea but it might be rather fun working it out and certainly a novel way of resolving harmony from discord.“
— Maurice Ravel
Maurice Ravel and unattributed. "Finding Tunes in Factories", Evening Standard, London, 24 February 1932. Also printed in: Orenstein, Arbie, ed. (1990). A Ravel Reader: Correspondence, Articles, Interviews, p.490-91. New York: Columbia University Press.