You know, they changed how you view music somehow. For me, I could name more but to keep it simple:

Final Fantasy VII Soundtrack
I was never the same.

Jagged Little Pill by Alanis Morissette
This was my first teenager album where I "connected" to the lyrics on some deeper level instead of listening to whatever my parent happened to be playing.

Britney Spears at the 2000 VMAs
Yeah, it's pretty silly, but this was my music moment that made me realize how a performance can change my opinion of the song. Sixteen years ago, she was basically my introduction to diva antics on stage (Madonna, Lady GaGa, Janet Jackson...)

Danny Elfman
Yeah, his soundtrack for movies such as Nightmare Before Christmas and Batman Returns had an impact on me.