9. which one of the following statements does not accurately describe the diatonic scale as it corresponds to the setup on a piano keyboard? a. the black keys are used to produce the five notes that correspond to additional frequencies on the even-tempered scale for the key of c. b. the white keys are used to produce frequencies for the key of c. c. striking a key on a piano keyboard produces a sound with a specific frequency. d. a scale would include a series of eight notes, where the first and seventh notes have the same letter.