I can't read a note of staff paper. And I find that tab to be problematic as well. If I could decipher guitar or banjo TAB then I could do so with standard notation. It is a visual processing thing for me. And any way, I'm not much of a hand at either instrument for several reasons. BUT I know a fair amount of theory for one so musically impaired. I know the scales. slowly. I can create chord structures in the major anf minor and 7ths. And I find this all to be veryt valuable. I would go so far as to say a musician must know at least the limited theory I know if they play guitar and banjo and shift between the two regularly.

Don