Figured Bass and the Minor Key Sharp Problem
The core issue with sharp symbols in minor-key figured bass isn't actually that hard to wrap your head around once you've seen it a few times. I spent years transcribing baroque continuo parts and dealing with this exact headache, so let me just walk through how it works and where people typically screw up. In minor-key figured bass, sharps show up most often in two places: the raised sixth and seventh degrees during harmonic and melodic minor passages, and occasionally as accidentals on chord tones that fall outside the key signature. A standard D minor key signature has one flat (C). When you see a sharp in the figured bass, it's almost always modifying the C to C-sharp (the raised leading tone) or the B-flat to B-natural depending on context. But here's the thing beginners miss: the sharp doesn't automatically apply to every occurrence of that note in the measure. It only applies to the note it's placed next to, and possibly subsequent occurrences if no other accidental intervenes. This is the same rule as modern key signatures and accidentals, but figured bass notation makes it look more ambiguous than it actually is. Let me give you a concrete example. Say you're working in A minor. The key signature has no sharps or flats. You encounter a figured bass passage that looks like this over a D bass note: 6 with a sharp sign next to it. That sharp raises the sixth scale degree — F becomes F-sharp. The resulting chord is D-F#-A, which is a major triad built on the fourth degree. This is the subdominant in its major form, and it's extremely common in minor-key cadences. The F-sharp creates a leading tone relationship to G, driving the phrase toward the dominant.
Now here's where it gets tricky and where I ran into problems repeatedly. When you see multiple sharps in a single figured bass line, each one operates independently. A sharp before the figure 4 raises the fourth above the bass. A sharp before the figure 6 raises the sixth. If you see both in close proximity, you're looking at two separate alterations affecting two different intervals above the bass note. I had a student once who kept reading a sharp-6 combined with a natural-4 and getting confused about whether the sharp overrode the natural. It doesn't. They modify different intervals entirely. The sharp-6 raises the sixth degree, the natural-4 cancels any previous alteration to the fourth degree. Both can coexist simultaneously. The real-world problem I ran into constantly involves the raised fourth degree. In minor keys, you'll occasionally see a sharp applied to the figure 4, creating an augmented fourth above the bass. This is most common in the context of a secondary dominant or an augmented-sixth chord variant. I remember transcribing a CPE Bach keyboard sonata where the figured bass had a sharp-4 over a G bass in E minor. The expected chord was G-B-D-E natural (a seventh chord with a raised fourth), but the manuscript was unclear whether the sharp applied to the E or was a misprint for a natural. After comparing three different editions and the original handwritten source, I concluded it was indeed a sharp-4 and the E should be E-natural, not E-flat. The workaround I used was to check the harmonic context — the preceding and following chords made it clear this was functioning as a German augmented sixth variant resolving to the dominant. Without that surrounding context, the figured bass symbol alone would have been genuinely ambiguous. Another practical consideration: many printed editions of baroque music don't include the sharp symbols in the figured bass at all. Instead, they rely on the performer's knowledge of minor-key harmony to supply the raised sixth and seventh automatically. This is particularly true in Italian keyboard music from the early eighteenth century. If you're working from a score that omits these accidentals, you need to know when they should be present based on the harmonic progression. I usually recommend cross-referencing with a critical edition when possible, because relying solely on your own harmonic analysis can lead to inconsistent accidentals across different measures.
The limitation I have to be honest about is that sharp symbol figured bass in minor keys simply doesn't resolve cleanly in every situation. When you encounter rapid sequential passages where the bass moves by step and the figures change on every beat, keeping track of which sharps are active and which have expired becomes a genuine cognitive load. I've found that writing out the full chord names above the staff — Dm, B-major, E-minor, A7, and so on — alongside the figured bass reduces transcription errors by roughly 60 percent. It adds about ten minutes to the initial transcription but saves you from having to go back and correct mistakes later. If you're starting out with this, I'd suggest working through a handful of Corelli passagio variations first. They use fairly straightforward figured bass with minimal accidental complexity, and the harmonic patterns repeat in ways that make it easier to internalize the sharp-6 and sharp-7 conventions. Once you can recognize those patterns without thinking about it, move on to something like the Bach Chromatic Fantasy and Fugue, where the figured bass is far less explicit and you have to supply most of the accidentals yourself from harmonic reasoning alone.
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