But that's the upper case versus lower case M issue. Which is why considerate arrangers and copyists don't rely on upper case vs. lower case M to distinguish between major and minor.That and it's where I was exposed to the M7/m7 notation as a shorthand for MM7/mm7. And as PMason encountered, this notation system is still in use. That is unless you want to insist that FM7/A is Fmin7/A. But go to the keyboard and see how ugly that sounds. U-G-L-Y!