Wikipedia tells me that tabulature has been around since, oh, 1300 AD or so. But "back in the day" in my lifetime, the only musical notation I ever saw was on a staff. Then I took some time (ok, years...decades even) away from the mainstream of musicians, music stores, etc. Now its TAB all over the place, in addition to standard notation. Admittedly, I could have been living a sheltered musical life back in the 70's and 80's...but if it was around, it never came up in all the bands I played with. When did TAB get so pervasive?