Yeah I noticed that, also "a Bb in the G minor in the fourth bar". Huh?

Also you used "begs the question" incorrectly ;)

http://begthequestion.info/

Everyone makes mistakes. I sort of agree with you that the writer should just stayed away from the music theory lesson as I commented below also, but it was a pretty good article I thought in other ways.

There are a lot of sort of half truths, e.g. on the one song yes, the changes were according to no strictly set pattern, while the author here implies that the whole record went that way. Also there is something in All Blues in which the little figure that the horns play is ALMOST the same through most of it, especially the first part on the I and V chords, but it's not true to say that "the harmony is the same all through the tune" or whatever it was. It's clear that some musician explained all this, or maybe several, but things got lost in the translation.

Here's my pet peeve: There's a beautiful note in the melody, a Bb over the Eb7 chord in the seventh bar. Everyone it seems ever since the original record plays it by dropping down to an A again, to sort of logically follow the D7 chord, instead of staying on the Bb which creates a +5 to the D7. It just kills me, every time I hear it, because that note just makes the song.

It's the little things....