Since the theme of this thread is music that inspired and/or got you into more diverse music (or just started your love for music) I'll add those albums. Again in no particular order:
AC/DC- Live
Lied about the order thing, this was the first truly awesome rock album I had ever heard. IIRC I picked it up in 3rd grade (?) and holy shit did it rock hard. It still rocks hard! Imagine hearing this when you'd been listening to nothing but country music for the last 3 years
Nine Inch Nails - The Fragile
King Crimson - In the Court of the Crimson King
The very first prog rock album I got on the recommendation of a friend's dad when I asked him what progressive rock was. Mind melted, head blown fool, whatever you call it 10 years later and I'm still addicted to prog rock and trying to find new bands.
Miles Davis - Bitches Brew
Discovered this sometime in high school, definitely went over my head the first few times. I think it was only in my junior year that I was able to appreciate jazz and this was the album I came back to.
Godspeed You! Black Emporer - F#A#(infinity)
An epic album. I've searched high and low for post rock bands that can do what GYBE have done and there are few that can match or exceed them.
John Zorn - Masada, Live in NYC
The album that introduced me to experimental music and introduced the concept that music still changes and people are still doing great things to make music "out of the box". Zorn is in my top 5 artists to see live before I die.
Sunn O))) - Black One
Holy crap this album is a beast. An entire album of the darkest droniest, bowel moving drone. I remember hearing it on the bus late at night on the highway, pouring rain. Came on with my IEMs and I felt truly afraid like something terrible was about to happen. No other doom/drone band does it like Sunn.
Ravi Shankar - Three Ragas
A gift from my dad, the album that introduced me to Indian classical music. Really good stuff here.