If you listen to the above backing tracks, they all have seem to have different moods, even stranger if you listen to them in different orders, the same tracks sounds different when you come back to it. To me the Concert Ab sounds the grooviest – weird.
If you pick a random scale, and then move to a different random scale, the next scale may or may not sound as nice or even better.
Practicing scales/arpeggios in alphabetic order (c d e f g..) seems different to practing them in 4ths (C F Bb Eb ..)
I suppose playing arpeggios in 4ths there is a melodic relationship; similarly if you practised them in ii,v,i order, or blues i,iv,v. I think it’s a good practise to make exercises up that you might encounter in tunes, or improvising. One exercise I try is to practise say, a minor chord 1,3b,5 but throw in a passing note, or even miss a note now and then:
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