The first record I bought for myself with my own money was (the shame) Deep Purple: Fireball. But the first record ever bought for me some two years previous by an indulgent parent was 'Abbey Road'.
Even though tone-deaf, the old man took good advice.
First rock 'n' roll/pop gig....Led Zeppelin Earl's Court '75. But many Classical things prior, including stuff I played in. (Brass section, Youth Orchestra thingy.)