To be honest, it'd be a bit of a stretch to say that Brian and I have bonded over this album. No, our friendship was forged from a different fire, a literal fire, one that launched model rockets hundreds of feet into the air. A fire that could have gotten us in trouble with the law. Yes, I'm making vague, confusing allusions to the time that we launched model rockets at the local high school baseball field late at night (read all about it here, fourth paragraph in).
In addition to a penchant for model rocketry, Brian and I also share similar professions. We're both accountants, although our respective functions as such differ greatly.
I think IV by Led Zeppelin was the first classic rock album I owned on CD (I didn't pick it up on vinyl until 2008). It was a sort of chicken-egg scenario: I either bought that album because I was learning how to play "Stairway to Heaven" (as apparently every budding guitarist should), or I was learning "Stairway to Heaven" because I bought the album. I was 15 or 16 at the time so I don't recall the exact circumstances.
It quickly became one of my favorite classic rock albums and remains one to this day.