Yes, Doug, I know the problem. I remember my accordeonlessons well. In my case it had to do with something very simple: I didn't relate to the exercises. Learning a song - one I liked, preferably - was easier than exercises. One should play these exercises, but not without the pleasure of playing what you like and what you relate to.

After about 4 years of learning the accordeon I got stuck. There didn't seem to be any progress. I just continued untill months later (maybe a year even) suddenly it got better again. I had lessons for more than 9 years, with ups and downs.

So don't worry: you are just human, not a sequencer

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drdalet