Whenever I run down scales or just pick individual notes, my left thumb is directly behind the fretboard and is straight. But whenever I play a chord (not including barre chords), my thumb completely wraps around. Is this a normal style of playing?

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As it has already been said, it is all about comfortability. I always for some reason thought it was like a bad habit, and not very professional, but hell I do the same thing all the time. I actually prefer the thumb wrapped around, cause it doesn’t put so much pressure on your thumb’s knuckle, haha.
But whatever is good for you dude!

GuitarRocker | Nov 04, 2008

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whatever is comfy for you is the best way dude
OFFAFO (Pro Metalcore) | Nov 04, 2008

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Doesn’t matter if it is normal, as long as you are comfortable.

As far as your thumb wrapping around, that is common. Some guitarists use their thumb to fret the low E string.
A Kind Of Magic [hates Obama] | Nov 04, 2008

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Go for what you know.
Don S | Nov 05, 2008