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I just checked since I’ve never heard it played with that Bb7 in bar 4... I’ve got one of the old unlicensed editions and it has the “right” changes, Cm7 / Cm7 / Fm7 / Fm7. Some of the stuff in the legal versions is particularly wonky.

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That's very interesting. I've only been playing piano for a few months and I was very surprised/distressed to notice this discrepancy.

There's tons of examples. Check Yardbird Suite by Charlie Parker in the RB, you'll also find a lot of mistakes :)

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