note that only m, m, m, and m give a one-to-one mapping (a complete set of 12 unique tones). this is because each of these numbers is relatively prime to 12. also interesting is that the chromatic scale is mapped to the circle of fourths with m, or fifths with m, and more generally under m all even numbers stay the same while odd numbers are transposed by a tritone. this kind of multiplication is frequently combined with a transposition operation. it was first described in print by herbert eimert, under the terms "quartverwandlung" (fourth transformation) and "quintverwandlung" (fifth transformation) , and has been used by the composers milton babbitt (; ), robert , and charles wuorinen . this operation also accounts for certain harmonic transformations in jazz .