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I was never able to learn guitar from him since he was upside down and i couldn't follow his fingers because of things like using a thumb in a G.
This kid's one of the best musicians I've ever met.

It was a challenge for sure, but I never knew any better so I suppose I felt like it was just part of the process lol. Some chords were easier, some a pain in the ass, reading tabs and following others is like looking in a mirror. I definitely use my thumb often haha.