The circle of fifths shows the relationship between major and minor
parallel keys. Also it can be used for modulation from one key to
another.
Circle of 5ths / What's New in v2.1
- fixed enharmonic change(there were different signs of alterations
in a key at the same time);
- fixed scale degree representation(I II III ... now are I ii iii
...);
- fixed sounding chord(no inversions now).