The first video he kind of explains why it is important, if you don’t use it you will lose it. He calls it harmonic upkeep, to keep these moves ingrained into your hands. Second video is for jazz guitar.
Thanks for sharing! I found these both very interesting.
As a beginner jazz player (so take my comment with a grain of salt) it’s not clear to me that you need to be practicing this a lot v.s. simply playing tunes. It seems important to recognise that songs are made up of these cycles, however. Then you can build a kind of shorthand for yourself when learning and playing them. Sort of like how some players can recognize a section of a tune as simply “a 6-2-5-1 in D” instead of memorizing D, B-, E-, A7.
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right its not really something you practice alot, it is just to occasionally run through to keep your hands accustomed to the motion.