I'm still not totally clear on using the a b or blank at the start of a bar.
I can't find a video that explains this very well.

-I understand the Intro (ie:start at bar 5)
-I understand "a" could be verse
-I understand "b" could be chorus


How do you mark a section as a middle 8 or pre chorus?

I like the idea of working with the "a" and "b" markings because the drums react properly with fills.

Thanks