I have been a subscriber since its inception, and I've kept all the issues. It has introduced me to lots of fine music over the years, as well as composers I'd never heard of before. I mainly use the music scores in it for sight-reading.
One uninteresting fact: I first 'performed' (sight-read the piano part while singing with my group) Bridge Over Troubled Water while on the ferry ship between Skagway (AK) and Bellingham (WA) many years ago: there was an 'official' Simon & Garfunkel piano songbook (with the well-known grainy photo on the front cover, and full lyrics, piano accompaniments and guitar chords) in the piano bench, which I used for our pop group's, er, I mean climbing team's pub performance. But I noticed that one important harmonic progression in the score was 'wrong', i.e. not what S & G actually used in their recording and live performances, so I corrected it when I played.
After that, I sought out other S & G books whenever I visited the music stores in London, but all of them contained that wrong harmony. Very odd.
But then, several years ago, one issue of Pianist Magazine included the song in its pages (one of its rare forays into the pop world). And I was surprised and pleased to see that it contained all the correct harmonies, and the piano part is the closest to what the pianist actually played in their recording. It's still the only score of the song that I've seen which contains the correct harmony.......