Recently upon reviewing some transcriptions I have done, I stumbled across a very simple and clear example of why transcription is so important I thought i'd share.
The transcription is of John Coltrane playing his composition "LazyBird".
Throughout the tune are (as you can guess) a few ii-V sequences (all resolving to Maj chords). At times, throughout the first chorus on a v7 dominant chord, Coltrane's melodic material is based off of the notes of a mixolydian scale. However there are other points where he adds a b9 and/or b13 to the V7. This creates a completely different melodic timbre for that resolution.
This is a great example of why transcription is so important. We have now discovered completely different note choices for a common chord change that if we followed the "rules", we would always end up playing the same mixolydian scale.

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