Did Paul Chambers Play the "So What" Bass Part WRONG?? (Miles Davis/Kind of Blue) — Music Theory Hat

While arranging all of Kind of Blue for my band, I stumbled upon a conundrum… if "So What" is supposed to be an exploration of Dorian mode, did Paul Chambers play the bass part wrong?

In the E-flat section of the head, he shifts notes that "should" be D-flats to be D naturals instead. Was it intentional? How can we tell, and what should a modern bass player do when approaching this tune?

Let's put on the Music Theory Hat and dive in!

Follow-up video:    • Paul Chambers (Miles Davis) "So What" Foll...  

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Chapters:
0:00 Introduction
0:25 Transcribing and Arranging Kind of Blue
2:55 What are Modes Anyway?
4:35 How Dorian Mode Is Used in "So What"
5:58 Is It Intentional?
11:39 So What… Should a Modern Bassist Do on This Song?
14:00 What's the Point?

So What:
   • Miles Davis - So What (Official Audio)  
   • Miles Davis - So What (Official Video)  
   • Miles Davis- So What-Isolated Bass and Drums  
(Note: I did not use this isolated bass/drum track in my video. I used the Stem Splitter feature in Logic.)

Soul jazz examples with occasionally ambiguous or shifting swing/straight feel:
   • Cold Duck Time (Live at Montreux Jazz Fest...  
   • Lee Morgan - The Sidewinder  
   • Gittin' Down  
   • Eddie Harris - Listen Here  
   • The Rumproller  
   • Stanley Turrentine - Sunny  
   • Cantaloupe Island (Remastered 1999/Rudy Va...