I'll want to exclude the note A and B out of the scale analysis - don't consider them as "must haves" in the scale but treat them as "melodic embellishments". Generally, a semitone moving up to a scale tone is a valid move and almost always sounds great (for example: playing B D# to C E over a C chord; another example, F# A to G Bb over Gm7). But a semitone downwards sounds weird if it starts on a non-scale tone. However in this case, I think the music really wants to develop this wobbling feel.N__K wrote: Mon Oct 11, 2021 2:40 pm Bars 0-8 (0:00-0:14) : the bassline
First four bars are all D. Based on that, one might think of D as tonic or "the home pitch". Second four bars have mostly Bb, but also A and B. So at this point, there are pitches D, A, Bb and B to guess the scale from.
I think it as a borrowed blues b5 - a characteristic bad ass vibeN__K wrote: Mon Oct 11, 2021 2:40 pm Bars 41-44 (1:13-1:21) : second part of second melody section
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This would be in D Natural Minor except for Ab, which is a tritone to D.
If I had to name a scale to fit those pitches into, I'd go for "Aeolian sharp 4" or somesuch.
