A flat major scale degree numbers1/28/2024 ![]() A flat major was "borrowed" from C minor. ![]() On the other hand, if the key was major: C: and an A flat major chord was played, it involves a chromatic alteration from the key signature which is applied to the Roman numeral: C: bVI. Cm: VI means a major triad built on the sixth degree in C minor which is A flat. In C minor the sixth degree and it's diatonic triad are A flat and a major triad by default - because of the key signature - no alterations are made, so no accidentals are added to the Roman numerals. Then the Roman numerals assume what is diatonic for that key signature. You indicate the key before writing the Roman numerals: Cm. In 'classical' analysis it works differently. If you want to indicate the sixth degree and diatonic triad from minor, you use a flat to show the scale degree is lowered from the major scale degree to A flat and use upper case to show the chord quality is major: bVI. In the key of C - assumed major - the sixth scale degree is A natural and the diatonic triad built on it is a minor chord. ![]() In jazz and pop that default is a diatonic major scale. One system simply uses upper case Roman numerals to indicate scale degrees with no reference to chord quality or scale type.įor systems that use sharps and flats the basic idea is they alter the referenced scale degree from some prevailing default. You need to know which convention is being used, because there are more than one.
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