15. Give enharmonic letter names for each of the twelve keys.
16. What is the sum of sharp and flat signatures of enharmonic keys?
17. By the use of this enharmonic sum, find all the theoretical keys.
18. What is the construction of the harmonic minor scale? Of the melodic minor?
19. Write on the staff all the minor scales (both harmonic and melodic) to eleven sharps and eleven flats, letting the teacher determine which clef or clefs to use.
20. What is the reason for raising the seventh in harmonic minor?
21. What is the reason for raising the sixth in melodic minor?
22. Why does the descending form of melodic minor differ from the ascending form?
23. Why does not the raised sixth or seventh appear in the signature?
24. What is an accidental?