Guys & Dolls was my first show, and I could sing almost any song from it by the time I was two. And I always loved to perform when I was really little, so my parents put me in theatre classes.
Then I discovered JCS when I was really little, too, and became obsessed with it by the time I was 4. I once did the whole show using action figures as the characters.
RENT made me really obsessed. Up until then, I saw shows, listened to recordings once in a blue moon, but didn't LOVE anything really. Once I found RENT, I became hooked, then tried everything else Broadway.
So, my final answer is G&D, JCS, and RENT.
I have my books and my poetry to protect me...