depends on who you are and what you want to do - i've known guys that know it all, and some who know literally none, and while they could likely benefit from some, they are great players anyway.
It comes down to your ear - you don't have to know the number and letter of every note, imo you just need to be able to hear in your head the intervals between notes.
The best "theory" i ever had was with a guy who did go to GIT in the 80's i jammed with for awhile - the most important lessons he taught me were note and pitch recognization - IE, we would take turns closing our eyes while one played notes on the guitar tuned to pitch and have to name what note was being played.
even now, i can tune to standard tuning give or take a few cents without a tuner or note to go off, it's just in my head, i can also tune down to D or B fairly well without a tuner and be close enough for rock and roll.
I found this out last night as i changed strings on a guitar that would be tuned to D i tuned it up initially by ear, and found that it was nearly dead on to D on the tuner.
It comes down to your ear - you don't have to know the number and letter of every note, imo you just need to be able to hear in your head the intervals between notes.
The best "theory" i ever had was with a guy who did go to GIT in the 80's i jammed with for awhile - the most important lessons he taught me were note and pitch recognization - IE, we would take turns closing our eyes while one played notes on the guitar tuned to pitch and have to name what note was being played.
even now, i can tune to standard tuning give or take a few cents without a tuner or note to go off, it's just in my head, i can also tune down to D or B fairly well without a tuner and be close enough for rock and roll.
I found this out last night as i changed strings on a guitar that would be tuned to D i tuned it up initially by ear, and found that it was nearly dead on to D on the tuner.
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