Actually did a little research on this and found what I think is the best and looks like it's been thought of before - LOL

A quote form the following site:

“To denote a modulation, we simply write in the new key and the Roman numerals for the chords below the ones for the old key, at least until the old key is no longer applicable.”

https://www.offtonic.com/theory/book/9-5.html


Neither the current BIAB system, keeping all the Roman numerals from original key even if tune is now in the modulated key, or changing the Roman numerals to the NEW (modulated) key with no chart indication that you are in new key. Example: a IV of I in Key of C [FMaj] looks exactly like a VI of I in G [CMaj] because they both have a chart indication of "VI," but they mean different chords/keys now.

If some form of the above, i.e., write both old and new Roman Numerals together somehow, could be implemented that be the great. I think if "/" (slashes) might NOT be best way to do it because it might bring up a lot of mental "overthinking (e.g., V of V = a Secondary Dominant chord, which is a borrowed chord from another key - kind of over too over thinking while trying to just play)



Last edited by Larry Kehl; 01/30/20 11:10 AM.
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