For me, I think it was a KISS song, because my best friend at the time started playing guitar before me and he was a big fan of KISS. He taught me a few chords and some KISS songs. I can't remember which one it was though. Geez, I was only 13 at the time, can't expect the old brain to remember all the details I guess. I do remember learning "House Of The Rising Sun" around that age though.