Thanks for the reply reminding me of your reasoning. Yes, a lot of adventurous jazz tunes are written in C because it’s just too difficult to assign a key signature, or impractical and confusing to change it rapidly each new key center. So, you are correct that BIAB is at a disadvantage in such tunes because setting the key signature in BIAB does have effects. The irony is that BIAB was originally developed to enter tunes from jazz fakebooks.

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