Minor Scale Roman Numerals
Here's how I actually use Roman numerals for minor keys, the way they're used in real transcription work, not the way textbooks present them. Start with the natural minor scale. That's your baseline. The chords built on each degree are i, ii, III, iv, v, VI, VII. Lowercase means minor or diminished. Uppercase means major. The third and sixth and seventh degrees are major in natural minor, so they get capitalized. The one, two, four, and five are minor. The two and seven are diminished, which you mark with a small circle after the numeral. So in A minor: Am, Bm7b5, C, Dm, Em, F, G. That's the default. Most beginners stop here, which is fine for basic pop and folk analysis. But it falls apart pretty quickly once you run into anything that actually uses tension.
The harmonic minor scale changes the seventh degree. Raise it by a half step. Now the fifth chord becomes major — V instead of v. The seven becomes diminished, and you also get an augmented third between the sixth and raised seventh, which gives you a III+ chord. In A harmonic minor that's C augmented. So your set is: i, ii, III+, iv, V, VI, vii°. The five is now major, which matters because the dominant function is what drives most minor-key harmony forward. If you're analyzing any classical or jazz progression in a minor key, you're almost certainly dealing with V at some point. The melodic minor scale raises both the sixth and seventh going up. That changes things further. The two becomes minor-major instead of half-diminished. The four gets a sharp five. The five is major, the six is major, and the seven is still diminished. The exact symbols shift depending on which convention your source uses. Some people write iv-#5 for the four chord in melodic minor. Others just don't bother labeling it that precisely and call it something functional instead. I ran into a specific problem a while back that made me rethink how I handle this. I was transcribing a piece that moved from D minor through a series of chords that didn't fit clean natural or harmonic minor analysis. The progression had an F major chord followed by a Bb major, which looked like VI to VII in natural minor, but then the next chord was a G7, which is V in harmonic minor D. The issue was that the bass line was walking up D, Eb, F, G, and each chord was changing. Natural minor gives you F to Ab to Bb to C. The Ab wasn't there. The piece was borrowing from melodic minor for the upward motion but dropping back to harmonic for the cadence. I ended up just labeling each chord individually rather than forcing the whole thing into one scale pattern. That's usually the right call anyway. Not every progression stays in one minor variant.
Here's a practical framework. When you encounter a chord progression in a minor key, first identify the key by finding the tonic. Then look at the fifth chord. If it's major, you're working with harmonic minor territory. If it's minor, you might be in natural minor or something modal. Check the sixth and seventh degrees in the melody or inner voices. Raised six and seven going up points to melodic minor. A flat seven with a raised seventh appearing only at cadences is typical harmonic minor behavior. The third chord being augmented is a pretty solid tell for harmonic minor usage. One counter-intuitive thing that trips people up is the chord built on the seventh degree in harmonic minor. It's diminished, but it functions differently than the diminished chord in natural minor. The vii° in harmonic minor has a leading tone, so it pulls strongly to the tonic. The vii° in natural minor doesn't have that leading tone and feels much more static. Treat them as different functional entities even though they share the same chord quality. I've seen analyses that label both as vii° without distinguishing the leading-tone function, and that misses a big part of why the progression works. Another thing nobody emphasizes enough is that Roman numeral analysis in minor keys is inherently ambiguous without context. The same set of numerals can describe multiple scale choices. i-VII-i could be natural minor or Dorian depending on whether you're treating the seven as a major chord borrowed from Dorian or as the VII of natural minor. The numeral alone doesn't resolve that. You need to look at the actual pitch content and the harmonic rhythm to decide. I usually write something like i(VII) or i/Nat. min to keep track of which scale I'm using as my reference, then note deviations explicitly.
Get the Full Details
Here's a quick reference for the three variants side by side in A minor: Natural minor: i ii III iv v VI VII Harmonic minor: i ii III+ iv V VI vii°
Melodic minor (ascending): i ii III+ iv+ V VI vii° For download purposes, I keep a simple spreadsheet that maps key to Roman numerals for all three variants. It's not fancy. Column headers are Natural, Harmonic, Melodic. Rows are the seven scale degrees. Each cell has the chord symbol and the Roman numeral with quality marking. I've been updating it for years. If you want it, search "minor scale Roman numeral chart" and you'll find several versions online. The ones from music theory sites tend to be accurate but dry. The ones from songwriting blogs often skip the melodic minor variant entirely, which is a real gap. The main bottleneck with this system is that it doesn't handle modal mixture well. When a progression borrows chords from parallel major, or mixes Dorian with natural minor, or pulls from the blues scale, the Roman numeral framework gets messy fast. I've worked on pieces where half the chords are borrowed from the parallel major key, and trying to force that into minor-key Roman numerals produces garbage. In those cases I switch to chord symbols above the staff and only use Roman numerals for the passages that actually follow diatonic logic. It's less elegant but it's honest.
For most transcription work, learning the natural minor set takes about an afternoon. Adding harmonic minor comes next and covers probably 80 percent of common minor-key material. Melodic minor is worth learning if you're doing jazz analysis or Baroque keyboard music. The rest is contextual judgment that comes from doing it enough times that you stop second-guessing yourself on every progression. The numerals themselves are a shorthand, not a complete description. They tell you function and quality relative to a tonic, but they don't tell you voicing, inversion, or rhythm. Two progressions can have identical Roman numerals and sound completely different. That's a limitation of the system, not a flaw in your understanding. Just be aware of it and supplement with actual chord names when precision matters.
