| Blue cells indicate diatonic functions in major keys only. |
| Yellow cells indicate diatonic functions in minor keys only (natural, harmonic or melodic). Flats appear in major keys only. These chords are diatonic in minor keys, but are chromatic in major keys. |
| Green cells indicate diatonic functions in either major or minor keys (blue + yellow = green). |
| Therefore, major keys include diatonic functions in Blue and Green. Minor keys include diatonic functions in Yellow and Green. |
| Purple cells indicate chromatic functions in major keys only. All chromatic functions are dependent upon the chord resolving logically. |
| Orange cells indicate chromatic functions in minor keys only. All chromatic functions are dependent upon the chord resolving logically. |
| Gray cells indicate chromatic functions in either major or minor keys. All chromatic functions are dependent upon the chord resolving logically. |
| Therefore, major keys include chromatic functions in Purple and Gray. Minor keys include chromatic functions in Orange and Gray. |
| Empty cells indicate that there are no logical functions for particular chord types on a those scale degrees. |
| Flats appear as lower-case letter "B"s. (There is no HTML code for a flat sign.) |