That's something that practically trips up a lot of students. They'll be missing some sign in the text because the "missing" sign is part of the illustration that readers tend to be blind to.
As I mentioned in an adjacent post, I've been playing jazz for nearly 50 years, and have not experienced gatekeeping, except on rare occasion from mediocre players. I've played with pro's, academics, and amateurs. The overwhelmingly predominant attitude is simply love of music and an interest in a challenge.
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