My ticket stub from 56 years ago (note the tape marks). It used to hang on my bedroom wall.Fifty-six years ago yesterday afternoon, I took my seat as a just-turned twelve-year old in seat E 102 in the last row of the Richard Rodgers Theatre (then called the 46th Street), to see the second-to-last preview of a new musical titled 1776. I knew nothing about it except its first ad in the Sunday New York Times, which d…