Great lesson, learned a lot about jazz. I feel stupid asking this... but in the first example with the diads, how is the diad Ab and D? Theres no Ab in the key of Bbmaj. Wouldn't the 7th be Anat? Unless your writing in Bb mixo or something like that, which you aren't because the walking line plays A natural. I know theres something I'm missing here about jazz and flat sevenths but I don't know what.
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