It's interesting the II shows up so frequently once he mostly boiled it down. A lot of old-timey jammers playing the songs he analyzed just don't play any minor

It's interesting the II shows up so frequently once he mostly boiled it down. A lot of old-timey jammers playing the songs he analyzed just don't play any minor chords so that beginners can keep up, so they play the II where it should be ii. I wonder if that's why II and ii is almost the same frequency.