Hi Ivan,
First and foremost, thank you so much for posting the videos and having such thorough material. I have a question regarding the notes on the last video of the Little Jazz Workshop (Chords and Arpeggios). You stated that "This is the Beebop scale...in conjunction with the mixolydian mode of that tonality." In this case it would be A mixolydian from the D major tonality. But how come later on you categorize the A mixolydian in the C Major tonality? My best guess is because A is the relative minor of C. But what if you decided to use a different modulation other than C major in addition to the D major? (then A mixolydian would not be able to fall under the C major tonality making the ability of placing the A mixolydian under the C major tonality an occurence of luck...hence if you use a different note (let's say E major) to modulate from D major, you wouldn't be able to use A mixolydian because A is not a relative minor of E major--in this case what other scales would you be able to use besides E major?) Thanks Ivan!
Sincerely,
Cliff

Hey mate Thanks a lot for you kind words!

First thing first, the text is a bit confusing, and there is a small mistake as well (will fix that soon!). The mistake is that D# is not within D Beebop scale. Instead of D# it is C.
So you may get the idea that I categorized A mixo in C major key, but that is not what it is all about, I've tried to show that if we modulate into C major key, A mixo would be turned into something else, and those are A dorian and A blues, cause all the notes are there, and we are actually using our C major as a minor third for the A mixo scale from D major to create a blue note. This way, our A minor/C major key can function as bluesy progression modulation, if you know what I mean.

Second thing if we modulate into E major, you can also use E beebop cause it has D note, and then you will get a tonic of the D major. This is important cause this D note helps you to create a better bridge between two scales when improvising. What is important is to analyze the chords, and see what are the strong notes. If in a give progression we suddenly go to E major key type chords, this D note will help in making a transition. There are numerous combinations available, so if you have some sort of a chord progression example we can analyze it if you want mate.