I am looking for literature on this topic. For example:
- How has the Roman numeral syntax changed over the years (from the Weber notation up to contemporary harmony textbooks)
- When did people start writing things like "V/V" (secondary dominants or things beyond the mere scale degree)
- When did people start writing Roman numerals with inversions of the form "V65", "V43", etc.
Any guidance on relevant literature about this topic would be very welcome.