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Roman Numerals in Music Theory: Don't Use Lower Case Roman Numerals
When using Nashville Numbers, always use upper case Roman numerals. For example, in the modified Nashville Number System, the chord Am7 in the key of C major/A minor should be notated as "VIm7" (“six minor seventh” or “the minor seventh of the six chord”). The chord AM7 in the key of C major/A minor becomes VIM7 (“six major seventh” or “the major seventh of the six chord”).
It's conventional to use lower case Roman numerals to signify “minor”. That is, vi = minor and VI = major. For instance, they'll text a friend, using all lower case: “yesterday i was working on a chord progression in the key of c and i was playing the vi chord ...”
Now, would that be the chord A minor or the chord A major?
Don’t do this. Do not use lower-case Roman numerals, ever. It can easily breed confusion. Instead, use an upper case Roman numeral followed by the letter "m," as in "VIm" (six minor).
Always use UPPER CASE Roman numerals when using modified Nashville Numbers.
Note, however, that there’s no "world standard" on this issue, as there is, for example, in tuning musical instruments, where "Concert A=440 Hz" is the recognized world standard. So if you insist on using lower case Roman numerals for minor chords, Marshal McDillon will not arrest you. But you might confuse somebosy.